Oh, I think they've "gotten the memo", alright. I'm sure they can see that for a few years now, owners have been paying resorts' HOAs and exit companies hundreds and thousands of dollars "to be out from under their timeshare". Although, I wouldn't say developers are "making money on both ends of the transaction". The resorts' HOAs are making money on the deedbacks while the developers are making money on sales.
Does it seem unethical? Perhaps, but hey, it's legal and that's the free-market capitalist society in which we live.
Also, if you "expect most places will jack their deedback prices through the roof", well, that's possible but that's a dangerous road for various resorts' HOAs to go down. If they significantly raise prices for deedbacks, then owners who want to end their ownership but who don't want to pay the deedback prices will either default or go seeking the "services" of these various exit/cancel/relief companies. That will lead to more complications for the HOAs.