@rayslava @evan
If Alice explicitly limited the visibility why could the reply need a broader range? Bob's subscribers won't see the original post anyway.
They shouldn't see the OP. They should see the thread from the interaction. Otherwise it makes no sense that since they interacted their subscribers would only see separate replies without any knowing to what it was or wasn't.
If they don't want anyone to see that, let them use DM to not confuse other people.
This would better be better applied to quotes
No, he shouldn't because Alice set the OP visibility like that.
And before you say "then why comments", I've already said that it confuses people around them. Force them to use DM or show to subscribers of both.
That's one part of fediverse's main problems: lack of obviousness.