Youtuber 1 https://www.youtube.com/watch?v=L9a5jQfdK7E
2nd channel for supcom only https://www.youtube.com/@professionalsupreme
youtuber 2 https://www.youtube.com/watch?v=1aNeiZsk3x0
3 https://www.youtube.com/@lenkin
4 https://www.youtube.com/@BassetH/search?query=Supreme commander
5 https://www.youtube.com/watch?v=Yj_ubAd4j1Q
Then there is Sid, FAF_Putin, Robogear, Arthas, Finisterre, Paralon, Wifi, Blinchik, Bravo
also me 😄
Sid made a discord server for russians and groups in VK social network
there was some other group before that that had 4000+ subscribers despite being dead and admin gone
There were at least two websites about supreme commander in Russian
Thoreyed mentioned at #2 not just made few youtube videos, he was explaining how to get started, made VK groups and discord server and many people joined there.
this is kinda from 2021 but not super accurate
i manually searched for youtube channels that have featured supcom at least once
as you can see many of them are Russian
sorted by subscriber count
2442c4a4-c90d-42bf-9d3a-aefdebf04b83-image.png
as you can see few are bigger than Gyle and if you see subscriber counts now, Gyle didn't really grow afaik, while for example Lenkin is 130k or something
i don't exactly know why Russians like it, but they do and it had kickstarted a chain of events when Yuri The Professional was making supcom vids and people (especially me) were helping and encouraging to make more.
Eventually his tetris video got millions of views and people started clicking to see the channel and they found supcom videos
Edit:
i have surely forgot some people like Espiranto, Banani, Kite, SMT5015, demonstreamer and more
There is just to many of those small Russian youtube channels 2586f416-40a0-4c45-bab8-7638798c881c-image.png
Edit2: I might be wrong but the part of the answer why there are so many Russians is that randomly some famous Russian state propaganda guy reposted Yuri Ivanov video about tetris and his youtube channel blew up in popularity and before that tetris video he was making quite a few SupCom videos.