There should be a kind of “sorting hat” personality test to attract the interest of prospective Lemmy joiners. People who love solarpunk stuff, for example, would easily find their home in slrpnk.net. Set a link to it on sites like join-lemmy.org to make the fediverse more approachable to casuals.
Not secretly, there is literally a list of blogged instances. There you’ll find nazis or titties Maybe both :)
(I don’t have the link at hand, but giyf)
lemmynsfw appears to be blocked secretly on lemm.ee. It’s not listed under blocked instances there, but I can’t see any posts from lemmynsfw there either. There must be some other mechanism that’s available besides blocking instances in the open.