Not sure that applies in this case. If the only party you allow to look at your code is one that's heavily invested in secretly hacking it, then you're probably

Not sure that applies in this case. If the only party you allow to look at your code is one that's heavily invested in secretly hacking it, then you're probably going to give them some zero-days which they'll use maliciously. It's different if you let everyone look at it, since a white-hat might find something helpful. But this isn't a choice between everyone and no-one, it's between a known black-hat and no-one.