Earlier quoted context omitted.
So someone explicitly chose to hide their email, and then on logging into an app is asked to share their real email. Anyone in that position would think the app is shady AF and user hostile.
Progressive consent makes sense though: in starting out with an app that i have no previous trust relationship, "Hide my email" sounds like a good idea in a trial balloon. If after using the application it tells me that to better use its collaboration tools it would like me to consent in giving a more direct email address, I might change my mind given changes in trust relationship (I have been using this app for some…
That said though, I don't see why the app couldnt just change their sharing model to an "invite link" based pattern. If I want to share something with a friend, why do I need to provide their private information to the app to do it? Why can't I generate an invite link and send that through my already established channels of communication? I don't think the "but your friends don't know your Apple privacy email" reason is very compelling. That might not work in their current system, but it is definitely not an insurmountable problem.