Pokémon Go could never have been made if this was the law.
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Adding a blurb about "guaranteed to continue working through yyyy/mm/dd" to its app store page would likely be sufficient to satisfy what this is asking for.
The game that sparked this movement was shutdown 9 years after it came out, and had 3 months notice.
I'd certainly encourage a more sustainable solution like a self runnable server, but I'd settle for replacing the word "buy" in marketing with "license" or "rent" with actual terms other than "until we decide to turn it off".
You don't get to make software a "license" but then not have any obligations to your licensee.
I agree that clearer language about what you are actually "buying" would be good for consumers, but it's tangential to Stop Killing Games.