Apps are challenging to preserve, but it’s the MMORPGs and online games that are almost impossible since there is no game without active servers and people playing the game. Hardware can be emulated and code preserved, so the apps you’re talking about could be preserved IF Apple, Google et al wanted to - which of course probably won’t happen, but still.
Well, perhaps that process would be more difficult and resource-intensive in this hypothetical scenario, so it would be much easier and less hassle to just keep the bodies alive?