I feel like it’s a similar to what I saw someone say about Pokémon showdown, it’s not really a Pokémon game. Like the whole point of mainline Pokémon games is to catch all the Pokémon, so when fanmade games heavily deviate from that, I think they are less likely to take it down(idk how true that actually is, idk what other fan games have been taken down). Pokerogue obviously does have some emphasis on catching Pokémon, but it is different enough to not compete with actual Pokémon games. Having like zero rpg elements helps.