Both Hubzilla and (streams), in practice the only Fediverse server apps that have a “public stream” and users other than the dev, can do a lot to keep content private.
But tell that to the Mastodon users who only know Mastodon and the Lemmy users who only know Lemmy, both of whom “know” that nothing in the Fediverse is private because nothing on Lemmy and effectively nothing on Mastodon is private.
Both Hubzilla and (streams), in practice the only Fediverse server apps that have a “public stream” and users other than the dev, can do a lot to keep content private.
But tell that to the Mastodon users who only know Mastodon and the Lemmy users who only know Lemmy, both of whom “know” that nothing in the Fediverse is private because nothing on Lemmy and effectively nothing on Mastodon is private.