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Animal Crossing: Pocket Camp will end service in Nov 28 - but will transition to a paid offline app
(files.catbox.moe)
Source about the offline app thing: https://faq.ac-pocketcamp.com/hc/en-us/articles/36353725150489-What-is-the-paid-version-of-the-app#
Taking away a game you bought because the game was intentionally made to rely on a server is always scummy behavior. That's the whole point.
If it's a game like an MMO (which several on that list are) they'd have to publish the server software in order to avoid fully killing the game. And to publish the server software that was only ever expected to run in their own datacenters they'd then have to publish documentation, dependencies, etc. and this is all assuming that it can be contained in a single installer for a single machine without relying on additional services they host, and assuming it has reasonable system requirements for average users to self host.
That's also assuming playing an MMO alone/with only 1-2 people doesn't suck. Play some 2009scape single player without adventure bots. It feels lonely as all heck
Plus there's all of the legal and PR hurdles to ensure you're not exposing yourself to undue risk.
Basically a million reasons for a company to not spend a thousand work hours ensuring their crappy MMO (I've tried out a couple of the listed MMOs, they were unsuccessful for a reason) can continue to be played after they've divested from it
Licenses and middleware can be chosen more proactively to preserve and distribute the server if they know during development that it's a requirement. There are tons of people who functionally play MMOs single player already, when the server is already running. And I play a 12 year old fighting game that's easily able to coordinate 20-100 people to play it multiple times per week with nothing but Discord; there's no doubt in my mind you'd be able to get 40 people together for a raid on a private server.
The other answer from @ampseandrew@lemmy.world already covers most points, so I'll just a few things: