[comex]

This is incorrect. Unmodified App Store .ipas are DRMed (app __TEXT is encrypted); the signature is of the encrypted binary, and the keys are tied to your iTunes Store credentials on the device. Piracy thus requires someone to decrypt the binary with a jailbroken phone, followed by either:

(1) installing the resulting unsigned app on a jailbroken phone, or

(2) re-signing it with a developer or enterprise distribution key, which Apple can revoke.

Both of these are done regularly, but it's not like Apple hasn't tried to stop it.

By the way, Apple no longer forbids Bitcoin apps, although this doesn't defeat the general point about forbidden categories.