Lets Plays on YouTube weren't quite as huge a couple years ago when Mark started (PewDiePie was one of the only "huge" names at the time, and Cry was also one of the more well known names of the time thanks to his friendship with PDP), he can't really help that the landscape of the site changed in the years since he found what he wanted to do on YouTube.

Ross of Game Grumps said one of the major problems with YouTube is that, ever since they changed how monetization works (from "amount of views" to "amount of minutes watched"), certain types of content on YouTube just isn't as viable for making a living anymore. The one that got hit hardest is animation, as not all animators can just make 10+ minute animations daily, while Lets Plays are much easier to do since half the work is already done for you by the games simply existing (this has also created the controversy that LPs are this weird legal gray area where it's like "technically you are profiting off of something you didn't create, but it's still transformative, even if it doesn't really count as a review").

Johnathan Ian Mathers of the popular web cartoon Neurotically Yours (aka "Foamy the Squirrel") has stated that one of the major reasons he made a Patreon was because he's just not making enough money off of his animations like he used to, and of course it can take him weeks or more than a month to make a new cartoon, so he's also started doing stuff between cartoons.

Not exactly that. He just feels like creativity is sorta being sapped out of YouTube. Like it kinda isn't as fun as it used to be when he started four years ago. I'd say more, but I think it would be better to just watch it and see what he has to say than from me.