Which seems fine, why would lemmynsfw try and federate with lots of other non-nsfw instances anyways? People are driven to making nsfw alts, and porn is one of those content types that enjoy long term organic growth without any advertising as users explicitly seek it out.

Isn’t a forum, as a concept, exactly what each Lemmy instance is?

As for growth, you will grow organically without explicit federation with non-nsfw instances. Lemmeynsfw is the porn Lemmy right now. You don’t need to have your porn popping up elsewhere for users to find you.

The content of this instance is such that:

1. User’s are likely to create porn alts
2. User’s are going to actively seek you out

Which means growth is guaranteed. Nevermind that explicitly trying to grow a community through non-organic means (where the community needs to make concessions for growth) harm communities instead of making them better.