But how is that different from any of the other privacy violations that are regulated? I doubt many of us could prove any damages from Amazon listening in on conversations made by our kids, or Google not properly disclosing that its tracking our search clicks and GPS location for better ad targeting.

In fact, I'd argue that leaking an email that exposes a private association with a mailing list to other unknown people has much clearer potential for damage than any of the privacy issues that big companies get fined for. And yes, CC leaks do happen (not a lot, in my experience), but I'm personally upset about it every time - much more so than when I find out Google didn't get my consent before recording half of my internet activity. Just because the violation is something that "happens a lot" because it can be done by accident by a careless individual doesn't mean it's less serious.