Twitter wants to validate each domain that has a card so they can approve & exert control. They cannot control what products a ribbon customer promotes via ribbon. If I wanted to sell illegal drugs or child pornography photographs, those would show up on twitter.com & twitter apps in a nice card-like experience complete with a 'Buy Now' button. That's why they shut it down.
all I really mean by this that if Twitter were not being malicious here they would be able to work with Ribbon and other companies who have similar ideas that could help change the internet for the better.