Got another idea in regards to how clients and their relays can monetize themselves, an addition to their subscription (think what can Damus Purple can add more):

You know how Twitter sometimes sends you an email containing a few tweets from those you follow or from accounts that post on hashtags you're interested in, ones where the system might think you'd be interested in based on various criteria (like impressions or likes, etc)?

Then why not have a program run on a client's relay to deliver a similar experience (via dm, or via a new nip to separate normal DMs from 'email' DMs).

#nostr