Just a note regarding the real-world usage of such a function, since this has existed for a long time already on the fediverse, where you also post your content to hundreds (if not thousands) of other servers/instances, and which I've been using over Twitter since 2017:
1. In almost all cases that I have deleted (or even better on Mastodon: "delete and re-draft") a post, it was within less than 10 seconds after posting the mistake. It's highly unlikely that normal people not running a surveillance machine would be able to save it that quickly, since they have to see it first, and then not have it disappear from their timeline immediately.
2. We have to assume that someone *is* running such a surveillance machine, so anything posted publicly has to be assumed to be indexed and searchable *by these actors*
3. Since Mastodon introduced post editing a while ago (i.e. publicly announcing changes to a post), I haven't used "delete and re-draft" at all anymore. This is because deletes were usually about fixing things like typos, grammar, formatting, broken links, etc.. Sometimes it is about changing the content itself, e.g. to remove an unnecessarily aggressive tone for example. But even then, it's virtually always fine if someone would be able to read the previous draft but know that my intention was to change it.
4. I do not remember ever having had to remove something that you describe causing the fear. However, Mastodon does strip image metadata automatically for example, and I think basic safety features like that are very important.
Anyway, just some personal observations, because we don't have to talk about it as if it's some kind of untested no man's land of decentralized social protocols. Hope it's helpful to someone.
Ironically, I just found a typo in this very note, and I'm unable to fix it from my Nostr client. :/
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