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. 

 I don't think category #1 is exclusive to family, it could also apply to anyone you want to remember but is prone to fall off your contact list, like friends from high school, favorite authors (so you know when they publish a new book), local businesses, etc. Basically stuff where you want several months of activity artificially compressed into a digest that you can spend 5-15 minutes on once per quarter to keep up, rather than 1 minute every day (a total of 90 minutes per quarter). 

 it should be called "stay in touch" for the monthly digest people

versus "keep hand on the pulse" for somebody who could potentially post an update any second that breaks your code ...