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Agree and besides that, I'm sure that he sign a NDA to the company if ever he really works there. Doing this kind of service only proves that he is not trustworthy by breaking all the agreement he sign. This is very unprofessional and shady services as fck.
That's another problem, pretty that companies have NDA to prevent leaks but it seems that it can be covertly violated if you make the leak anonymous as much as possible and at the same time careful. Definitely shady and unprofessional so we better be careful, if they breach a contract then they can probably cheat on you.