I think this is possible on nostr as well if you share a key with all the followers and encrypt each post. Is there a better way to achieve this?
Discussion
Better yet encrypt the post them distribute the master decrypt key that has then been encrypted again for each authorised viewer.
This technique allows the original data to be encrypted once (could be a video that takes some time to encrypt) then only a small additional effort to manage the chosen audience without sharing the unencrypted master key.