Do they get adopted by other instances? Are they still accessible from other instances? Can you still post on them from another instance?
Edit: From my understanding every instance that deals with a community has a cached copy. Will that copy disappear after a certain time, because it can’t phone to home anymore?
Gyfycat has also been running for 8 years, Imgur for 14. I’m talking only about the longevity of a service running. I don’t think people are expecting any instance to run for that amount of time, though its obviously too early to tell.
Clearly these large centralized services eventually decay away due to power hungry individuals within, but it takes some time.
I’m not sure if people are going to read this as I’m pro-centralized services, because I’m not, I’m just making statements.