Tootdon has a search server, which indexes the public toots of the federated timeline for searching. You can search the latest toots for 30 days, and those older than 30 days will be automatically deleted from the server. Also, when posting from the application, in the case of public toot, we also update the index of the search server. If you do not want to be indexed, we will exclude that account if you request @tootdon from your account.
@tootdon I'm the Mastodon.Observer admin. Please do not index toots from the Mastodon.Observer domain, thanks.
@tootdon There is a opt-out option within the mastodon settings which should be used for reliability.
I don't see why admin suddenly take this for their whole instance .-. Just put a no index tag somewhere and tootdon should check back if profile pages allow indexing or have a noindex tag on their profile and the robots.txt of the instance.
It's nothing new that there are search indexes. And people who don't put the opt-out in place explicitly allow search engines to index their postings.