Title says it. Apparently lemmy devs are not concerned with such worldly matters as privacy, or respecting international privacy laws.
OP is simply incorrect.
I’m coding a Lemmy alternative right now and have been testing this functionality out extensively. Deletes of posts and comments certainly federate, I’ve seen the AP traffic to make it happen. Also, the docs: https://join-lemmy.org/docs/contributors/05-federation.html#delete-post-or-comment
I haven’t tested what happens when the ‘delete account’ button is clicked… Mastodon solves this by sending a ‘delete this user’ Activity to every fediverse instance so there’s nothing about ActivityPub that makes removing an account and all it’s posts in one go impossible.
Deletion of entities is optional in ActivityPub. That, by definition, makes known-removal of an account and all its posts in one go impossible, because a server can just ignore the deletion activity.
Yes, although the server will not ignore the deletion activity if that server is running Lemmy. We’re talking about Lemmy here, not the fediverse as a whole. OP singled out Lemmy in the post title and said “lemmy devs are not concerned with…”
I’m sure there is more to be done in this area. It’d be great to know for sure which software treats deletion activities properly (I’m really unsure about Kbin, I think it does not) and which does not so instance admins can make informed decisions about who they federate with. Perhaps this information could be made available right within the UI that Lemmy admins use to control their instance, rather than an obscure documentation page somewhere…
IMO having deletes federate should be part of a minimum standard all fediverse software has to meet (plus mod tools, spam control, csam filters, etc) before it is allowed to federate but obviously we’re nowhere near having that sort of social organisation.
How would you even know if deletes federate?
“Does your server respect delete activities?”
“Yeah. Yeah. Delete activities. Definitely. We totally respect them. Scout’s honour.”
Tell me: how much closer are you to knowing if the server is caching or not?
This is likely why deletion is optional. The people making the protocol know there’s no way to enforce it.