The only people who are experts in a particular industry are the people running the businesses that make up that industry. So the government, in order to try to make rules that don't suck, depend on their input when drafting the rules.
This, and in combination with significant lobbying, means that given enough time the industry being regulated gets to have significant amount of control over the rules being created.
Oil, airflight, cars, steel production, cable television industry, etc etc. Everything that the government tries regulate suffers the same fate to differing degrees.
And when it comes to certain industries, like banking or medical industry, and handful of executives of top corporations end up rotating in and out of government. Being a VP one year, a lobbyist for a couple years, and then end up as a higher level bureaucrat on some cabinet or board somewhere.
They have a phrase for it: