For example, I try to see !gonewild. If I go directly there I won’t be able to see anything because I’m not logged in. If I try to search for “!gonewild” in the communities tab in the FMHY instance I get no results. I also tried this from the lemmy.ml instance where I also have another account.
The only solution I see is to create an account on the NSFW instance.
[PSA] Communities will only show in 'All' of you instance if someone in that instance has searched and subscribed to it.
Try to visit other instances and search their interesting communities on your own instance so there is a better federation among all instances....