I thought my youngest was all about watching hour long Minecraft playthroughs but really they are quite interested in game mechanics and speed running. They are just a lot more tolerant of watching hours of videos around a particular game.
I don't overly police their content consumption (although we do talk about limiting shorts). The main thing is at the weekend to kick them off the TV after the morning to go and do something more interactive.
Sure if they needed to bypass ads I can introduce them to Free tube or whatever but for all it's sins they need moderated exposure to the YouTube experience so they're equipped enough not to go totally wild when they finally have unfettered access.