For this to be respectable on Twitter's part, they should have outlined what policy violations were committed.
As someone who has a number of twitter apps, all this does is make me feel even more afraid of twitter's increasingly hostile attitude toward their developer community
Marshall Kirkpatrick (of ReadWriteWeb) tweeted that Twitter suspended UberTwitter for "changing tweets to monetize, trademark infringement, privacy issues with DMs."
As someone who has a number of twitter apps, all this does is make me feel even more afraid of twitter's increasingly hostile attitude toward their developer community