It’s also not possible to redact things so if you shove it out there, it might be out there forever.
To be honest, is that different with other solutions? I mean if you post something to your whateverAccount, you might be able to redact it... that does not mean that it isn't out there anymore though, just that your profile does not show the old content anymore, right?
I am thinking about what you describe since 2017 and have written a few words about it lately (just posted them, so shameless self-plug here): https://beyermatthias.de/a-distributed-social-network