Only if you submit crashes and feedback IIRC

Still, important project!

That’s a weird assumption. The reality is that they could if they want because of the TOS.

TestFlight doesn’t share the email for users that sign up with the public link. Only if testers are invited via their email https://developer.apple.com/help/app-store-connect/test-a-beta-version/invite-external-testers

sharing email downloads with the public? 🫡 sharing email with your stupid husband like my mom does? 😡