A CPA is required to higher other professionals when their knowledge doesnt reach to the subject in question, so yeah they would get a security or privacy specialist to help them. The upside of using a CPA is that they would look at the entire process. The rapport of a CPA is going to be a lot more expensive though.

In the US people defend that companies don’t publish their annual reports, plus some people also defend these companies regardless of what they do. It’s almost religion. But if you would require companies to at least publish some figures and require bigger companies to have a statement signet by a CPA then more of these companies would have issues. Since a CPA can generally get in a lot of trouble if they mess up (at least here in NL)

They don’t need to be hostile audit’s, heck that’s probably the worst way of doing it. Work together with the company and help them to pass the audit and they will be more transparent .