How do you manage to make your subs hidden before registration?
Is it default when using NSFW mark or there's smt special going on?
It's sure a killer feature for private teams who wants to have their own little space
Bonus: maybe you know, is there a way to make sure the community cannot be discovered and read without registration?
I don't think private communities would really work on lemmy, due to the federated nature of the platform and how the data is shared to other servers.
I think that NSFW content is hidden from unregistered users by default, the communities will appear empty until the user signs up and subscribes to them (with the show NSFW flag enabled on their account of course).