i have an idea also that at some point i might add a background service that harvests all npubs that appear in requests and events to a list and periodically polls the network for updates to these kinds of events from another list that collects unique relay URLs as a service to the paid users so when they make reqs that hit their paid relay they get information about how to find other users

discoverability is not really that hard a problem, just that nobody's really defined what it means... Directory events are my working hypothesis about an element of what makes nostr discoverability work, simply sharing information that essentially represents information akin to what you find in the old school "white pages" phone directories, in the times before spam becoming a huge industry