alt Hacker NewsYes you can.
User signs up, uses @outlook. Your app declines it and explains that they block with no way to remedy, and explain they are a bad vendor.
Replies
ethin • today at 3:59 AM
Lol if you do that, your service is just going to have a small minority of people and most people will just not bother using your app/service entirely
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Deeply unserious take.