this post was submitted on 19 Jun 2023
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So just to clarify this point:
If I delete a comment on beehaw.org, it doesn't get deleted when accessed from another Lemmy instance that federates with Beehaw?
When you delete it your instance tells others that it was deleted, but it cannot force them to follow through.
It cowld defederate any non-compliant instances.
It could, but actually policing it would be difficult. I don’t think there is any “yeah I’ll do that” response and even if there is an instance could say it will delete it and still do nothing.
You could defederate with instances running versions that don't delete federated posts. Removing compatipility with older protocol implementations is not unheard of.
while this is certainly feasible, it is just a compliance checkmark of "doing your best". It wouldn't actually prevent someone attempting to persist that data. For example, I just need to maintain an insert-only copy of my deletion-compliant lemmy instance DB, and none of the deletions would be reflected on that.
I could then host that copy publicly on some unrelated lemmy instance, and without systematically de-federating from all other instances, you wouldn't know which one was retaining the data.