So there's an extra transaction
It's accepting free stuff in exchange for government money.
You don't give gifts like that out of friendship and then rat out the friend unless the friend backstabs you but good. And we would have heard about the backstab. Well, unless you are a total born rat, but a total born rat doesn't last long in that kind of business environment.
No, you give stuff like that and then turn when it is business. And business means profit, so the value of the quid has to be significantly less than the value of the quo. Graft costs much more than outright theft.