If Alice makes a followers-only post, and Bob replies to it, to whom should Bob's reply be visible?
@evan other -> the intersection of Alice and Bob’s followers.
@steely_glint so, as a conversation continues, the audience gets smaller and smaller and smaller?
@evan probably. I don’t see that as an intrinsic problem. The constant broadening of the audience is one of the vices of commercial social media. Maybe Bob has 2 options , Alice’s followers or the (smaller) intersection. But he shouldn’t be able to widen it against Alice’s intent.