DVC knows who the commercial dealers are. *I* know who some of these people are. Every point is registered thru Member Services and they can easily see the activity. If we accept that the commercial rental restrictions are valid and legally enforceable, the only real question is why DVC hasn't acted. Is it because Disney thinks they still benefit from this rental/contract flipping activity in some way? (I'm skeptical). It it because they're worried about the fallout from attacking these organizations? Are they simply ambivalent?
Another option: abuse/misuse prevention is not easy. Very high level, it requires hiring or developing employees with essentially fraud prevention expertise and developing systems and processes to identify and enforce. Some of these employees might be need to be very highly paid, or the Legal department might need expansion, etc.
All of that requires leadership buy-in that the investment is worth it,
whatever that means (financial, reputation, owner experience, etc.). There's risks too, like an exec being deposed or having to testify in a lawsuit.
All this to say that there might be key individuals who have the power to do it and really want to do it, but every time they investigate bringing it to fruition, it's deemed not worth the effort, or maybe even too far out of their current expertise to be comfortable making the call to invest.
Anyway, my preferred (albeit aggressive) way to combat this is to cancel reservations 28 days prior to check-in. I like it because it attacks both the supply and the demand.
Only do it to reservations that they're absolutely sure are rentals. Considering the lack of enforcement currently, that's probably pretty easy to identify as renters haven't adapted to enforcement yet.
Wouldn't even need to cancel a lot, just enough to cause pandemonium online and break trust in the system, especially at the guest-renter level. Maybe 10% of a week's 'commercial' rentals to get started?
28 days out is enough time to fill 7-day waitlists and refill occupancy, but also late enough that the guest-renter and the owner-renter would be in a real bind.
As a prospective guest-renter, could you imagine if you knew you had even a slight chance of having your reservation for your Big Trip canceled on you essentially last second, leaving you to deal with the owner-renter/agency to recoup money and also find new lodging? I would totally steer clear as a guest-renter. And I strongly suspect guest-renters are very much Dis-Online and would hear about it from blogs/influencers/friends/etc. Word would spread and "renting's not safe" would be widely known.
And likewise with owner-renters, with having to lose out on future income and having a stay's worth of points in Holding.
After renter adaptation maybe that cancellation rate has to slip to 2-5% to make sure there's no false positives, but that's plenty to deter significant portions of both owner-renters and guest-renters from the market entirely.