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.