@ghost@davidsgallant@polymerwitch Aside from blocking, a flag on a user's profile might be a good approach. (A site could default to one or another setting and maybe also let users set the option.)
Def understand some might not want to be searchable; it's also reasonable someone wants to implement it (that's the #2 requested hard-to-answer feature after anti-abuse systems I get asked about when talking about federation)
If tooling respects that, a block might not be needed.
@cwebber @email@example.com @firstname.lastname@example.org @email@example.com For precedent, I note that livejournal has some user settings like this. (and has for about 15 years, if memory serves. It appears I last updated my profile 9 years ago.) https://mastodon.social/media/Y0_OafyA1A_hhkInlho