Currently largest and most successful YouTuber on the platform (by a wide margin), started out by doing challenge videos about himself (24h in ice, that kinda stuff) that he’d invite friends to as the goody sidekicks causing mischief and making his challenges a little harder/more interesting.

These days, his stuff has transformed into a media powerhouse with absolutely crazy levels of production work. All of it is still challenges, but now with far higher stakes and involving other people in competitions against each other to get the money. Think of it like a game show, like “last of these 100 people to leave the circle wins $500k”, “kids vs adults - group with the most people still in the game after 5 days gets $500k distributed among the participants” - where several days (sometimes months) of filming all gets cut down to one 10-20 minute long video. Still featuring him and his friends causing mischief and making the challenges harder.

Then there’s also just “look at this thing” videos like “$1 to $10,000,00 car” where him and his friends check out increasingly expensive cars until they eventually get a whole bridge cordoned off to drive in the most expensive car in the world.

TL;DR: Today he’s both an internet gameshow host and an internet rich guy in one, and he does some philanthropy like his “raise money to plant 10 million trees” campaign.