And if no one else uses your relay then what? You can get one setup behind TOR in 10m. But of no one knows about it or uses it its not super useful for you.
Discussion
I don't think it matters. Assuming the outbox model works properly, your notes are fetched from your relay and served to viewers. You don't need to be posting to the same relays as viewers.
To fetch notes from your relay they have to subscribe to it.
You can run a private relay for friends and family.
Outbox works differently. I have outbox relays set in my profile. A client that supports outbox will connect to them to grab my notes even if it is not in the users subscribed relay list.
Thanks for the info. New rabbit hoke to go down.
You sure? If you're following someone I think your client fetches their relays and gets their notes automatically. That's why there's no longer any need to use 20+ relays.
On the outbox model, your client is connecting to the relays of each of your follows and sending all filters to them. That could mean up to 200 relays that are connected to your phone and looking to what you are doing.