Twitter is Opening Their Messaging API?

Lots of folks are talking about Twitter opening their SMS messaging API.

Let's leave the economic issues alone for a moment.

The Mobile Marketing Association (MMA) has a set of guidelines (pdf) about acceptable uses of Common Short Codes. Does not Twitter risk losing their CSC if some random person using their API promotes drug use, pornography or hate speech (or any of the other things MMA or the carriers find unacceptable)?

What am I not understanding here?