They’ve already moved away from Unity for their new games, but still have active, published games based on Unity that they can’t just drop entirely, and can’t develop for without it.

Make it P2P or player-hosted and then you don’t need to pay for server costs.

It’s not a AAA GaaS, there’s no real reason for them to host the games.

It hit the spot that Lethal Company held when that stopped being fun. They were clearly aiming for the same kind of game, but I don’t think they expected it to get the attention it got.