Gregory's Server@jdp23 confirmed that yes, in Mastodon v3 google will index the text of unlisted replies to indexed posts:
It also appears that in Mastodon v4 you can do the same:
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4 comments
 @jdp23 I think all we can really do is try to make it clear that "unlisted" opts you out of *mastodon* discovery but is still public information. (I basically never use unlisted for security reasons, only for courtesy reasons like not clogging up the local timeline)  @darius yeah, it's not obvious what to do. On youtube "unlisted" means "not discoverable by a search" so that is probably how. most people think of it. One thing is for sure, they should be a lot more candid in the messaging. "We don't provide full-text search because it can be used for harassment" is a speedbump but not really a protection. It makes Mastodon seem safer than it really is, so missets people's expectations. |
@jdp23 I don't think there is a great solution for this.... like, a warning modal when you are about to reply unlisted to a profile that mastodon knows to be indexed? also how would mastodon know a remote page is indexed? scraping the user's profile page before every interaction?