this post was submitted on 20 Jun 2025
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I think the fediverse has a built-in legal risk in that any time someone posts, data is sent to a large number of servers when then make it available via the web or sometimes push it to additional servers (e.g. by user boosts or community subscriptions). This is currently done without any explicit license for the IP contained in that post.
I'm inclined to think that irrevocable permissions are the right thing here, in large part because it's impossible to guarantee that any subsequent signal from the original poster propagates to everyone who has a copy of that post, or that the server software responds how someone else expects it will.
So CAP theorem says you can have a distributed system with at most two of Consistent, Available, or Partition tolerant. I haven't looked too closely into the federation implementation of Mastodon but I suspect they opted for Available and Partition tolerant (as Consistent and Partition tolerant would mean the entire network goes down when one node does, while Consistent and Available would mean once any node lost contact with the network it could never again rejoin). Since consistency is not guaranteed (and provably can't be) there is absolutely no way to guarantee that deleting something from one instance will remove it from all instances even allowing for a very generous time span.
TL;DR: You're not just right, you're mathematically right.
Mathematically right, the best kind of right.