They can. For Mastodon there's an option for "Opt-out of search engine indexing" which adds a "noindex" tag to your profile which Google respects. Not all indexers respect the tag however and "noindex" data isn't federated which can cause your replies to show up: https://github.com/mastodon/mastodon/issues/22047
They can. For Mastodon there's an option for "Opt-out of search engine indexing" which adds a "noindex" tag to your profile which Google respects. Not all indexers respect the tag however and "noindex" data isn't federated which can cause your replies to show up: https://github.com/mastodon/mastodon/issues/22047