In long term, corporations can buy everyone, unfortunately.
This is the fact, and I would say that almost no one is immune to money offer. (You have to be very financially secured. But then, you are probably from the similar class as corporate people. -> simulate level of greed)
If you (as governmental employee) have some issue to solve, e.g. alimony or faster mortgage repayment, you are vulnerable… and you have to have very strong conscience not to accept any “services”. It is similar to be strong not to ear sugar or fat-loaded chips or drinking…