I have a story about that! In my case it was my legal firm, they were even worse!
Privacy story time. A law firm (I've since fired) had those "legal" notices in all their email they'd send me. I told them multiple times that email is considered public and any information sent via email is the equivalent of shouting it on the street corner. Nothing happened for the longest time. Then I get an email from them out of the blue "Your closing documents are ready." Closing documents, what closing documents? Suspecting spam/phishing I check the header and it's really from who it says it's from. All the scans of the pdf they sent come back as clean, so I take a look. They had sent me the closing documents for some poor guys house. I had ALL his and his wife's PII (personally identifiable information, I've done too much PCI compliance by now.) Fired off another reply, copying the state attorney general office, this time including a couple of references to Ohio law cases that made it clear email is a form of public communication unsuitable to any sort of private correspondence, no matter what sort of disclaimer is contained within said email. Haven't heard from them since (good riddance.)
Guess if I ever turn to a life of crime I'll be all set for using an alternate ID..... Not really, deleted it after having finished dealing with the AG's office. Wish they would have let me know what came of that whole deal.