That's why they shut it down.
They're simply protecting themselves from a series of problems that would be completely out of Twitter's control to help in any way. Twitter would always come up the loser for any of Ribbon's mistakes. They don't even have a way to punt any support issues over to Ribbon.
It's very clear that Twitter want to control every possible aspect of the monetisation of Twitter.
I propose "network traps", "progress sinks" or "sucker tub". I don't know but I keep getting a recurring imagery when thinking of these situations as of someone building a house on a raft, which immediately capsizes, but the buoyancy of the house causes the raft to lift out of the water.
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.