You're not alone. For how immensely popular he is, I've yet to ever watch any of his videos, or even have YouTube recommend them to me.
Only reason I know about him are a few videos from other channels, like the epic rap battles of history episode, and one that was criticizing his ghost kitchen. But I think the first time I heard about him was when every YouTuber was trying to jump on his hype when he was planting a ton of trees or something like that?
I tried watching a video of his once because I was genuinely interested in the subject. There were so many jump cuts it was unwatchable. Now I know all YouTube videos for kids are like that
YouTube creators in general have loves their jump cuts for ages. At first I think it was because they were amateurs who were be to video editing and didn't understand established editing techniques. But now they do it intentionally because kids can't sit still for too long.
From what I hear he's really not so objectionable and people enjoy his videos. I am yet to ever watch one though and that's purely out of spite. Somehow YouTube seemed to try so hard to push this dude in particular that I decided to specifically not watch anything he was in, this meant avoiding his stuff and also anything from anyone else I actually like if I could tell from the thumbnail or description he was going to be in it. I just about managed it because I've never seen anything with him directly, but I have ended up seeing parodies of his videos so I now in spite of myself know what must usually be in them, and I've seen the famous video critiquing all the spin off food businesses he's started up off the back of his famous name.
He's probably really not that bad, even if his obscene wealth is objectionable, but my contrarian nature just can't abide all the hype and cheerleading. Hopefully when he finally stops being popular, I'll have managed to miss everything he's in and maintain my pointless personal record of dodging the beastly bullets.
I also haven't seen anything from him, but I've seen things that talk about him. My understanding is he's a guy who makes outlandish videos, and some of that is "charity" (is it charity if you profit more off the video about it?) that got really popular. Other than that, I don't really know what he does.