Remember the 1990s and early 2000s when there were tons of easily discoverable forums? Moderation was less of an issue -- each forum was someone's fiefdom, but there was an abundance of choices and communities available at each choice.

The solution to censorship definitely isn't non-deletion. Usenet died for a reason and 4chan is fringe for a reason. The solution to censorship is a healthy choice of venues, good discoverability, and low/no switching costs. Basically, modern phpbb forums or discord but searchable.