Also note that when you publish to mainstream platforms you also can't take things down if someone else doesn't want them to go down.
I can quite easily make a bot that backups everything you post on Twitter and posts it somewhere else.

Once you send something to a receiver, there is never any technical way to take it back. It's an actual impossibility.
And if you *publish* something, everyone is (potentially) a receiver, whether you publish it using Nostr, Twitter or anything else.