Hikaru is making inroads with streaming culture, so honestly the group that might know him best are younger people, not even necessarily chess players. He's known for... well, being exactly himself, and it fits perfectly with the rest of streaming culture, so honestly it's a great match.
While we're talking about money, Hikaru has 4.4k subscribers [0] on his twitch channel, of which he makes $2.49 per (so $11,115.36 per month), in case you were curious about what kind of monetization he's able to create out of this.
[0] - https://twitchtracker.com/gmhikaruIf you're a novice (or even club) player and you've never seen a video of him solving puzzles, do yourself a favor and watch one [0]. The goal is to make the best move (usually winning a piece or forcing mate) as fast as possible. Chances are he can find the best move before you can even locate both kings on the board, unless you have some practice solving puzzles.
It really seems impossible. The puzzles I'm proud to have solved in a minute or two he will literally solve in 2-3 seconds.
Really drives home the difference between a GM (though Hikaru is fast even for a GM) and the average player.
[0] - https://youtu.be/sPE_ve1CrHo?t=20