https://dereferer.me/?https://www.youtube.com/watch?v=srG_KrMqXlo    teenie
https://dereferer.me/?https://www.youtube.com/watch?v=qpOCwreN5eE  teenie
https://dereferer.me/?https://www.youtube.com/watch?v=6QHwDpjLHtI   adult
https://dereferer.me/?https://www.youtube.com/watch?v=iezbQ8M9a7g   teenie getting off
https://dereferer.me/?https://www.youtube.com/watch?v=LMNh0BrO2Ic   17 yo
https://dereferer.me/?https://www.youtube.com/watch?v=bAmObD-tdGA  adult
https://dereferer.me/?https://www.youtube.com/watch?v=sS9MFOTM1mM male
https://dereferer.me/?https://www.youtube.com/watch?v=mD-Hon-HZCw  adult glasses
https://dereferer.me/?https://www.youtube.com/watch?v=nRaOSr8zGh0   male getting off
https://dereferer.me/?https://www.youtube.com/watch?v=pSvNhWazYjs    male glasses
https://dereferer.me/?https://www.youtube.com/watch?v=pvvHUMX6qBY  adult

https://dereferer.me/?https://www.youtube.com/watch?v=hAYVIxnDRNQ   adult
https://dereferer.me/?https://www.youtube.com/watch?v=mNr6FN4JGiQ    Is she a model?
https://dereferer.me/?https://www.youtube.com/watch?v=EDl4fvXXqeM     teenie glasses
https://dereferer.me/?https://www.youtube.com/watch?v=rh0jUPnJsoE      adult elastics glasses
https://dereferer.me/?https://www.youtube.com/watch?v=pbVESiQX5r0     adult
https://dereferer.me/?https://www.youtube.com/watch?v=yMAzCPWwkrs   adult glasses
https://dereferer.me/?https://www.youtube.com/watch?v=nQNMKgQhiMM  adult
https://dereferer.me/?https://www.youtube.com/watch?v=X5EWDTGcEUk  adult
https://dereferer.me/?https://www.youtube.com/watch?v=PebIdFvbdxk     adult glasses, long videos, more updates
https://dereferer.me/?https://www.youtube.com/watch?v=0eAxJq2Gs5E    adult once more
https://dereferer.me/?https://www.youtube.com/watch?v=o_m-Go_0Lzo    adult glasses

https://dereferer.me/?https://www.youtube.com/watch?v=ObLy53uzG_g    teenie
https://dereferer.me/?https://www.youtube.com/watch?v=ZTWnGtVSrhE   adult glasses
https://dereferer.me/?https://www.youtube.com/watch?v=ef8sPrJW2C8     adult
https://dereferer.me/?https://www.youtube.com/watch?v=pYx-GIVQ16E    late teen
https://dereferer.me/?https://www.youtube.com/watch?v=HoxDS6zs3BU   late teen
https://dereferer.me/?https://www.youtube.com/watch?v=qLR8c9C-JvI      adult
https://dereferer.me/?https://www.youtube.com/watch?v=PvzC_gyRvtA     adult glasses
https://dereferer.me/?https://www.youtube.com/watch?v=ERumZYFLx1U   adult
https://dereferer.me/?https://www.youtube.com/watch?v=zVhbJEShezU     adult
https://dereferer.me/?https://www.youtube.com/watch?v=ITDbm_o6No4   adult singer
https://dereferer.me/?https://www.youtube.com/watch?v=u1eW1L8QV74   late teen

As expected it's just russian rubbish, no thumbnails on the search side findings, 80% of the videos "temporally unanvailable", profile pages contain sometimes recently viewed videos of other users

I think it was an interesting find, cult, and it was not that bad as you qualified it in the end.
Some videos from there:
https://dereferer.me/?https://rutube.ru/video/8c686c12d18f73880e45be8edf6c1de0/
 https://dereferer.me/?https://rutube.ru/video/023d4591d5127f03cf2903587159504a/ beauty, seen on YT before, though
https://dereferer.me/?https://rutube.ru/video/94ad1beed930a68451c2bbb07bc6f80b/ elastics
https://dereferer.me/?https://rutube.ru/video/e7dedf4e8142401086c5feff3416c7e2/ clear
https://dereferer.me/?https://rutube.ru/video/789b1a76e36d24dafa5c5b8c5f20e6c9/

acornjohn had a video in his never stopping collection of new ones with an attractive (hence intelligent/eloquent) Russian lady, who got her braces off after 4 years.
https://dereferer.me/?https://www.youtube.com/watch?v=S6zUGMoCsvU
It’s funny that she kind of complains, she misses the braces and her front teeth feel naked and her upper lip sort of retracted. She (thanks God not seriously, I hope) reflects on getting a lip filler injection to make up for that … which would render her similarly disfigured like many Russian women of her age. 
Her grey fluffy cat is an extra bonus

https://dereferer.me/?https://www.youtube.com/watch?v=50i36OGf_68 Two adult women with braces. Possibly a third one, not sure.

Sorry for yesterday, I hit wrong key and lost all links. But it wasn't very good day, not many finds.

https://dereferer.me/?https://www.youtube.com/watch?v=onhTtYG3DCk   adult getting on

https://dereferer.me/?https://www.youtube.com/watch?v=V8A7WpdxW4E      Elastic (3:57), after adjustment (10:44)
https://dereferer.me/?https://www.youtube.com/watch?v=TnTriusPHLQ          Power chain (3:16)
https://dereferer.me/?https://www.youtube.com/watch?v=f78iaRtxIVU           Ceramic w/ power chain
https://dereferer.me/?https://www.youtube.com/watch?v=P8uzz9Bi1bc          Adult w/ power chain
https://dereferer.me/?https://www.youtube.com/watch?v=-WTPsVBQwjc        Lower power chain close up (0:22)
https://dereferer.me/?https://www.youtube.com/watch?v=2sloXBKlmoc         ! Close up
https://dereferer.me/?https://www.youtube.com/watch?v=l6B6-B4DY-o          Male
https://dereferer.me/?https://www.youtube.com/watch?v=5ndy9YbpW-Q       Ceramic close up (1:06)
https://dereferer.me/?https://www.youtube.com/watch?v=TZ0Khd2I2z8         Upper power chain, close up (3:46)
https://dereferer.me/?https://www.youtube.com/watch?v=fbnFTCFQ3WM       Jaw surgery bands & process (0:25)
https://dereferer.me/?https://www.youtube.com/watch?v=FgQHypQeCvE       Sister w/ power chains (1:37), brother w/ elastics (2:00)
https://dereferer.me/?https://www.youtube.com/watch?v=HUGQiQDNGh4      Adjustment, power chain close up (5:17)

https://dereferer.me/?https://www.youtube.com/watch?v=fjaT8T--Yp4           Close up of teeth cleaning w/ braces (0:53)
https://dereferer.me/?https://www.youtube.com/watch?v=a2dzBuwKgeM       Sisters w/ power chains & elastics (2:40)
https://dereferer.me/?https://www.youtube.com/shorts/ECXpNJMvj8A            ! Male update w/ power chain, upper/lower appliances (shorts)
https://dereferer.me/?https://www.youtube.com/watch?v=TePlYsw9JvU          Getting on
https://dereferer.me/?https://www.youtube.com/watch?v=0s_yoxN51K8        Getting ceramic close up (1:32)

Great, Cult and Bracessd, thanks!

https://dereferer.me/?https://www.youtube.com/watch?v=ft_aZuBySX8    male
https://dereferer.me/?https://www.youtube.com/watch?v=5vG2eIf1MCY   adult getting off 
https://dereferer.me/?https://www.youtube.com/watch?v=Xa9IPFRM2Po   adult
https://dereferer.me/?https://www.youtube.com/watch?v=Mo0e80LfixA    adult
https://dereferer.me/?https://www.youtube.com/watch?v=mtW3lQOkwfk  adult
https://dereferer.me/?https://www.youtube.com/watch?v=UreWD5JqyNc   adult getting on
https://dereferer.me/?https://www.youtube.com/watch?v=VnRFxmQKdcc   adult getting off
https://dereferer.me/?https://www.youtube.com/watch?v=Tm6zsBNEuuc   adult getting on
https://dereferer.me/?https://www.youtube.com/watch?v=mYSpoUBTTjY   male, now off
https://dereferer.me/?https://www.youtube.com/watch?v=F4X-9an7jw0    adult
https://dereferer.me/?https://www.youtube.com/watch?v=5_LW4vbrAUg  adult !

https://dereferer.me/?https://www.youtube.com/watch?v=w9-zBT_fgok    adult
https://dereferer.me/?https://www.youtube.com/watch?v=q6lioxbdG0Q    adult
https://dereferer.me/?https://www.youtube.com/watch?v=OmLhetuLzUU  male
https://dereferer.me/?https://www.youtube.com/watch?v=q9LWpqOeBzU  male
https://dereferer.me/?https://www.youtube.com/watch?v=R6DvRzmDT7w male
https://dereferer.me/?https://www.youtube.com/watch?v=4ZwQeLbvgaQ  adult glasses, long videos, more updates
https://dereferer.me/?https://www.youtube.com/watch?v=oM2c3lCfRcs     adult
https://dereferer.me/?https://www.youtube.com/watch?v=649JeTpPkUI     adult
https://dereferer.me/?https://www.youtube.com/watch?v=DJ82u1zSMUI   late teen
https://dereferer.me/?https://www.youtube.com/watch?v=TpWEW9K55A4 adult
https://dereferer.me/?https://www.youtube.com/watch?v=Mo0e80LfixA&t=38s   adult

https://dereferer.me/?https://www.youtube.com/watch?v=KmeY3_mKgso adult
https://dereferer.me/?https://www.youtube.com/watch?v=cpDgH7h45-w   adult
https://dereferer.me/?https://www.youtube.com/watch?v=P7DHWyXeLBA  adult
https://dereferer.me/?https://www.youtube.com/watch?v=CJGcgIng-aY     adult
https://dereferer.me/?https://www.youtube.com/watch?v=cJV-LsSTXmQ   adult
https://dereferer.me/?https://www.youtube.com/watch?v=hnoGbN9EjEk   adult, more updates
https://dereferer.me/?https://www.youtube.com/watch?v=M_fUR6E1fS4   adult
https://dereferer.me/?https://www.youtube.com/watch?v=RryTdi9DvGM   adult glasses
https://dereferer.me/?https://www.youtube.com/watch?v=WscEivJViwQ   adult glasses
https://dereferer.me/?https://www.youtube.com/watch?v=Rs6cTvtReDM   adult singer

https://dereferer.me/?https://www.youtube.com/watch?v=TmNHRLyWrTY    teen
https://dereferer.me/?https://www.youtube.com/watch?v=khxGNNXPID0    teen