They do! I blogged about this a while back, so the links below are for iOS 5, but they have definitely done it in the past.
http://appadvice.com/appnn/2011/08/apple-takes-steps-against...
http://thenextweb.com/apple/2011/08/05/apple-closes-develope...
http://osxdaily.com/2011/08/05/udid-activation-and-ios-5-bet...