[To answer the original question: No there isn’t nor should there be]
While this is true, the privacy concern comes from the perspective of people searching for topics other people discuss to jump into the discussion, also known as Sea-lioning
This is a very special kind of harassment, and it is unfortunately widespread on places like Twitter where you have this kind of search.
If people want their posts to be searchable they can add a hashtag on it.
While it may not exactly fall under privacy concerns, it does fall under “anti-harassment”, and that is why this issue is a wontfix.
For exemple: if someone would like to see if anyone on Mastodon ever critics a company for a product. then he can not. So this will make duplicate post…
mastodon as a great potential but if you limitated becase you are worries that people may JOIN an OPEN conversation that’s disappointing. because in my idea we could choice to create an open www or private discution
Edited for tone. Please keep it civil, and refrain from swearing or calling other users “stupid”. - N