Welcome. Nope, once noted, can't really be undone!

I mean, you can request deletion but that doesn't mean the relay operators will remove it.

It’s a feature of #nostr not a bug 😀

Yes! Always a feature, never a big with #thenostr

Indeed. One should think twice before posting anything here. Also: No relay can possibly store all content if Nostr ever goes mainstream, so there is a chance that, unless you run your own relay or pay for one, public relays will only save a few days worth of your notes and then notes will simply disappear - which would actually be good as well. I think social media should be a nervous system or neural network of society. Long-term memory should be blog posts.