For a multiplayer game, especially for something like an MMO where there's lots and lots of content that exists only on the server, there's an interesting question. How do you keep the game going? Do you force the company to release a full working server with all of its content? I'm not opposed to that, but it's a much taller ask than "allow the end users to keep using their clients."

But then who's allowed to run servers? Can I modify the servers and mod them and republish my changes? Does killing the game also need to cancel any copyright on any server-side assets?

But then we need to get into licensing. What if Fortnite goes offline and they publish their server assets? Does that give me the right to use Naruto and Family Guy avatars on my homebrew server?