There's no law that the resorts have to be run by smart business people (except for the law of business economics that says the dumber people eventually get outcompeted out of business - gee how many ski resorts have gone belly up?). From the conversation I had with the USFS expert on the subject out of Colorado, virtually no one has applied for a permit to operate any kind of indepedent business on already permitted property ski resorts. Also hinted at from the conversation was that most resorts are not reporting revenues and paying fees on "freelance" operations (e.g. camps) conducted on their permitted property under permission of the resorts. I got a distinct sense of the guy not wanting to rock the boat
when he offered that maybe this was something he should look into. IMHO, the rules change was not intended to prevent or complicate friendly freelancing. However, the intent to close the loopholes for unfriendly freelancing has done just that.
The bottom line here is that almost everybody looks the other way for everything but the most blatant poaching of business because it's a very small problem that is not worth "fixing". If resorts made a formal policy on this stuff, then they'd have to do it right. It's just too complicated to make it worth doing right. Looking the other way is the cheapest solution to the problem.