For example, the players may want to wants to mod the game-server with features, bug-fixes, or moderation-tools, while the publisher wants a strict lockdown to their artificial monopoly on "digital goods."
> Now remember that online gaming is an extremely low-trust environment.
Tied to the above point, I believe this trust was slightly-but-meaningfully higher when people could form their own servers/communities and be "regulars".
However publishers didn't like that arrangement, because it threatened their ability to sell cosmetics, collectibles, and sometimes outright gameplay advantages.