I assume this is because the YT annoying dumb face thing is simply less enticing than ... the scenes and "expressions" they can get away with on a porn site. I'

I assume this is because the YT annoying dumb face thing is simply less enticing than ... the scenes and "expressions" they can get away with on a porn site. I'd guess a large set of youtube creators would be more risque and scantily clad in their thumbnails if YT would allow it. So... let's just be glad YT only allows mouths to be agape on the thumbnails you have to scroll past.