...it's shutting down its servers and deleting everything.
...most are never seen or heard of again.
The first would suggest that Tw@ter haven't bought Quill for their service. The second that using their clout to buy up anything that looks like a competitor, just to shut it down, is business as usual at Tw@ter.
Looks a lot like the business model of a right bunch of evil, festering, scumbag bastards to me.