An interesting read, especially the follow-up on DoD purchasing policies but... This is not really about corruption but rather about brutal business practices?

An interesting read, especially the follow-up on DoD purchasing policies but... This is not really about corruption but rather about brutal business practices? It focuses on "wining and dining" your customers and then robbing them blind through details and fine print in contracts and abusing politics as a means of pressuring the victims. Corruption as I understand it would be bribing the officials with money to get the contract. "Wining and dining" and invitations to nice places is very close and there is a fine line between that and down right bribery. Or did I miss a notion of corruption here? Not a native speaker.