To be honest, I thought I was the only one getting the pixelated videos since my phone is pretty darn slow but after seeing the amount of people who share the same problem as me I'm going to say my opinion. It is really annoying considering the high amount of videos that I watch and YouTube should really fix it. I have tried and it doesn't happen on the Pc/Laptop version of YouTube and one more thing, the high amount of bots in the comment sections of videos. Please fix it Youtube.