So I've been watching a lot of anime on YouTube recently. It's mainly the stuff from the Nineties and prior, but with some more modern mixed in as well. Some of the titles include Demon City Shinjuku, Escaflowne, Megazone, Gunsmith Cats, Dominion Tank Police, Coyote Ragtime Show, etc. Most of these shows are full screen and at normal playback speed. I've found more modern series like Overlord and My Hero Academia, however they're usually in a small corner of the screen and the audio is sped up or slowed down. So while you can watch it, I wouldn't recommend it.