> Whats most tragic is it's not expensive to just allow players to host it themselves for a game thats already multiplayer.

It's infinitely expensive, because older games compete with new ones(not everyone cares for looks and there are mods that can make this argument obsolete). And new ones don't always win. Especially with introduction of game as a service. There are many tactics used by modern developers to squeeze more money from players, that modern gamers don't like. And if gamers had a choice many would go retro. This is why WoW Classic exists. This is why emulation exist. This is why people develop open engines for old games. And this is why it is in developers best interest to prevent their older games from competing with new ones. Especially if people were to learn that they could get free skins for their games in past, while modern ones demand cash for even basic palette swap.