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PSA: You can't delete photos uploaded to Lemmy. So don't (accidentally) upload a nude
(tech.michaelaltfield.net)
This is a most excellent place for technology news and articles.
This post provides a fairly detailed claim of the opposite. Federation isn't part of the issue he's referring to at all. It's that deleting the image post doesn't delete the direct link to the file, and that doing so as an admin is really convoluted. He goes through the issue and his effort with an admin trying to help in a decent bit of detail.
I can't actually test myself because I don't have a server, but as far as I'm concerned the issue he's claiming is a complete showstopper.
It's not super straight forward, that's true. But it's not that hard I would say. But I'm a professional software engineer, I dunno if all admins find it as easy.