I'd use the hell out of categories !, 2, & 3, but I think they may be named wrong. Why not simply call them "Family," "Interesting," & "Never miss" or something more self-describing?

As for the subscription category, I can't imagine who would ever use Nostr for that. Seems pretty useless since I don't see anyone here coming to buy products or services, but I do see lots of people following merchants like NVK, interested in hearing what he has to say on occasion. (And eventually buying his products in their own sweet time.