This thoughtful dive into the legal/ethical/technical mess that is Mastodon search is so good.
"Stated in the most general possible way: The Fediverse needs to get its content-licensing shit together."
by @timbray, who knows a thing or two because he's seen a thing or two
https://www.tbray.org/ongoing/When/202x/2022/12/30/Mastodon-Privacy-and-Search
there is no way to stop indexing or archiving or data-mining on a public, unecrypted system full-stop. Ideally, if there was an auto-pgp option on posts, with the keys handed out to just followers, following or server members depending on settings you could actually get some protection.
EDIT:after this @edbott sent me a message saying "Bye boy.", deleted his replies to my points and blocked me: mature journalistic behaviour 🫠.
Ed Bott
.neek