If instance A stops existing, instance B doesn’t have any specific knowledge of that versus it no longer federating. Existing posts and comments will stay. My instance is no longer federated with some, but I still see the communities from them.
Comment on Lemmy.one will be shutting down
EndlessNightmare@reddthat.com 2 days agoWould your post/comment history be lost as well? Will posts/comments show up as [by deleted user] or w/e?
JackbyDev@programming.dev 2 days ago
Saleh@feddit.org 2 days ago
AFAIK they would remain tied to your old account. The instances copy everything off each other. So if reddthat.com would go down, your comment would still show as EndlessNightmare@reddthath.com If you were to make a new account on a different instance it would not have your posts and comments “attached” to it.
This could be an issue if you rely on reputation for something that is tied to your account. In that sense having some mechanism to proof the old account to be owned by you would be good.