I just embrace impermanence. Fediverse is not much other than some other person's server, and if the instance owner decides he doesn't want to host his instance anymore, you're just gonna have to cut your losses and move somewhere else. It's not as if the entirety of Lemmy is gonna stop existing at once.

The real threat to Lemmy's existence is the maintenance of the software. If that stops, there are 2 options, either someone forks it, or the medium slowly dies out as no one feels like hosting outdated software anymore.

In that case (which, might I add, is unlikely to happen), you're gonna have to cut your losses, and move to a different type of social media