This makes me 😭
UPDATE: Thanks @[email protected] for this update: The issue has now been commented on and was closed by the maintainer, where they explained why those blocks would be nonsense. But it appears the OP wants to still talk with maintainer privately about it.
Hard for me to understand how blocking valid email providers like Proton, Tutanota, and Skiff, would actually mitigate any abuse. All it’s going to do is hurt the websites with this filter and prevent privacy-minded folks from signing up. Unfortunate to see, hopefully they get some common sense and don’t block these for no reason.