Who's going to police who?

The extent of any policing that will take place is already taking place - webmasters choosing to avoid working with people who engage in illegal or highly unethical practices, shunning involvement in questionable behavior, not supporting or sending traffic to programs that do illegitimate things, and openly sharing information amongst one another about who to look out for.

That's the most policing we can expect, and really the most that should exist from within the industry.

There will always be those bad apples in any industry that make the whole look bad and that operate outside of accepted standards of practice. But short of some draconian, extreme methods, what can the rest of us do about it that we're not already doing?