There is a channel with 2 million videos: https://www.youtube.com/@RoelVandePaar/videos One with 4 million videos: https://www.youtube.com/@NameLook
First one has transcribed stack overflow to YT by the look of it
I guess I should have mentioned I wasn't looking for automated/AI-generated videos.
NameLook puts a whole new meaning to "low effort videos"