I have worked a company where this has happened, and it wasn't even the company themselves really. They went into administration, and the administrators came i

I have worked a company where this has happened, and it wasn't even the company themselves really. They went into administration, and the administrators came in and wanted to see if they had anything of value. Data is of value, so they sold it to a rival company. Not a lot you can do about it really, apart from not store the data in the first place.