I think a fundamental aspect of cracking consists of disabling such detection mechanisms. But if the cracker only digs far enough to ensure that it seems to work without nags, and not far enough to find Easter eggs, then it will probably work for a while until people catch on and demand a further crack.
It's really the OS that needs to detect a lack of expected signature, because the cracker isn't going to be able to disable an OS feature unless they release the cracked app as a while VM or something. But that's a thing...
I think a fundamental aspect of cracking consists of disabling such detection mechanisms. But if the cracker only digs far enough to ensure that it seems to work without nags, and not far enough to find Easter eggs, then it will probably work for a while until people catch on and demand a further crack.
It's really the OS that needs to detect a lack of expected signature, because the cracker isn't going to be able to disable an OS feature unless they release the cracked app as a while VM or something. But that's a thing...