>>718205215
Because they have to succeed at it first, and a live service succeeding is completely random with zero guarantee. People only have so much time and already have one or two live service games they're dedicated to usually. Marvel Rivals only got big out of a very specific disdain in Overwatch 2 happening at the exact same time it came out and it being a recognizable brand on top of that. It cannibalized OW2 numbers and Blizzard even started chasing its features like a third-person mode. Helldivers 2 for some reason randomly got latched onto by PC players specifically which blew up its numbers.
Mihoyo released both HSR and ZZZ and both are cannibalizing Genshin's userbase and all three of them are doing well but not some sort of juggernauts.
Live service is a dumb industry to get into because it requires immense luck to succeed and when you do it's only consistent revenue until you drop the ball, and the initial numbers you get will never be the numbers you retain.