Maybe this is the beginning of paid access. Just follow those who paid you and they will have access to your content.
I made this relay: https://lockbox.fiatjaf.com/
Anything you publish there will only be shown to people you follow (they have to perform AUTH before reading).
If you add it to your NIP-65 list of "write" relays then all clients that do outbox should automatically start showing those posts to the people that follow you that you also follow right away.
