Blame market demand. Quake was also halted. UT4 was halted 3 years before Fortnite was out. Fortnite wasn’t even supposed to be a battle royale, it just coincided with the popularity of one. The original game mode Save the World that it implemented wouldn’t even had had any crossover with the fps multiplayer deathmatch shooter genre. Even games with novel mechanics like Titanfall have struggled and failed to survive in it. I think the generation that never got into Minecraft and think of it as just as a joke kiddie game is still resentful of the types of games it encouraged and continues to do so.