Why did Apple ban th Trapcall app

I occasionally get annoying blocked calls on my iPhone. Trapcall is THE ticket, so why did Apple ban it from the app store.

Trapcall is legal, and I believe that I should be able to know who is calling me, and not allowing them to hide behind *67.

Can I set my iPhone 4S to reject all blocked calls? I am an AT&T Wireless user.

Thanks