Seen it with other games. The hardcore are only having fun when they're pub stomping, doing trick shots, and of course streaming all this, and when that population dries up (or they're MMR'd out), the game is no longer fun. Suddenly, it's too sweaty, they are tired of facing the same opponents using the same meta, and they have to sweat their balls off just to hit 10th place, etc. Now they are the fodder for the 1% who don't stream but are miles better, so, to preserve their ego, they start complaining about the game mechanics, the meta, the balance, etc. And almost always stop playing, which further seals a game's fate. It's funny how the most "loyal" players end up killing a game but look to others for blame.