Doesn't the same thing apply to bribery? I can gift you something, and I can ask you to do something. But if I do the first conditioned on the second it's bribery.
The illegal thing about bribery is that you give money to an individual for them to do something on behalf of an organisation. Paying someone to do something isn't illegal, but you're harming the organisation by encouraging the individual to act differently than in the best interests of the organisation.
More generally, one cannot, in practice, blackmail someone over a harmless fact. This is so even if no one but the victim regards the fact as having any importance.