I suppose I was thinking of Nostr as it is now, but yeah what you say does make sense. With current tools available it would be slightly tricky for a non-techy disgruntled co-worker to do much, in a low effort way. But yes, it sounds like somebody could build them a very easy tool. (I suppose in this scenario your best bet may be to Delete All and they'd have the same problem as searching through all posts lol, but then why bother).
I disagree with the description of this being people who believe in permanent history vs 'pseudo-privacy'. I think everyone pretty much knows by now the internet is a permanent record. I was merely hoping for a scenario of there being at least a skill/effort barrier and reduction of ease and possibilities.
But yeah I also know v little lol as a non-techy user.