Unless I’m misunderstanding your question, the specific server is more important than the software they’re running; it doesn’t matter if the software is being developed long-term if the server shuts down in the short-term… your community will go down with it.
This is the answer. Pretty sure, for example, MetaFilter is running bespoke code for their forum (which means no development at all), and it’s been online since 1999.
Your community will not go down with a software dying or a server dying. As long as the server does not die surprisingly, you can just move to a new server, announcing on the old server that you have moved. Active members will follow then.
Can you carry over the posts and comments to the new community?
If the community has to start over from zero, that can be a huge loss.
From Lemmy to Piefed I believe so. I don’t know any other details tho
