His audience is mostly kids yes but not all of them.
His content can and is too annoying for a lot of people and that’s fine but it’s also entertaining to a lot of other people. I’m sure that you’ve had the situation where the most famous band, sport, food etc isn’t something you like. And that’s totally ok. It turns out we kind like different things. I’d argue it’s a good thing.
Also people severely underestimate him just because they don’t like his content or for some other reason. Pretty much every big YouTuber will agree that he is extremely good and optimizing the algorithm and that’s not an easy thing. If it were everyone would be doing it and the truth is that not a lot of people get close to his success.
Some of his videos are just for shits and giggles but a lot of them in does give a ton of money to people in need. Some people dislike that he does this for his channel and don’t like him for it. However the truth is that in the end he gave more money to people in need than everyone in this comment section combined.