A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
We lose the communities from that instance, yes. And that's why people want to make sure you don't have one dominant instance on the threadiverse. But frankly that issue will be there unless you have a fully decentralised system.
That being said, other instances will have a cache of the activities happening on this other instance. You can then fairly easily recreate it from this cache, and if you have a lot of storage, can also have a limitless cache.
It is indeed a flaw, though it is in itself already a fix for the single-instance services, such as Reddit.
If an instance becomes unavailable/defederated on the fediverse, a large portion of content will become unavailable, but the service will still be functional. If a single-instance service becomes unavailable, or if the admins do something stupid, ALL data will be jeopardized.
I know that this might not be the answer you seek, but I think it helps adding perspective to the problem.
Lenny? Lenny?
If we lose Lenny we still have Carl.
If an instance goes down (permanently), federation of all of the communities hosted by that instance essentially stop. The content that has already been posted remains but anything new added to those communities only remain on your home instance. The only way for federation to resume is for that instance to come back online with the same domain it started with.