> Wouldn’t it only require action from you if you were trying to kill multiplayer in the first place?
It's a question of when, not if - you're not going to pay to keep the servers online forever. What are the legal consequences of not releasing a functioning server if for some reason you can't? If they're bad enough then plenty of people will not be interested in taking that risk by making such games.
> What are the legal consequences of not releasing a functioning server if for some reason you can't?
How about "the government forces you to release the code"? That's seems fair.
Unless you hid your source code in USB drives under your bed, the government can probably just force GitHub (or similar )to release it. I bet they've got it backed up.