Doesn’t make much sense for Hikaru to cheat. He competes over the board where it’s much harder to cheat, and he makes most of his money through streaming, not through competition results.
But they have tutorials, put tons of effort into entertaining content, etc.
Hikaru doesn't.
People watch Hiraku because they want to watch a top 5 player.
Offline, he is #4 is slow chess and #1 in Blitz.
He's not facing strong challenges on Titled Tuesday, and (like all top players) he is so good that there simply aren't enough players and data to make the empirical Elo scale work for assessing his win probabilities.
The stronger he is, the more his name is listed as the winner, the more viewers he has.