I suspect this has a lot to do with it.
It’s pretty easy to find (for example) a guaranteed Animal Kingdom Lodge stay for $300 per night.
Why hand Disney tens of thousands of dollars, or go further into debt, when you can book a
DVC room (with no long term commitment) for the price of a Moderate Resort?
I also suspect websites advertising Deluxe Resort stays for 50% or more off rack rate are making it difficult for Disney to fill their Deluxe Resort rooms at the prices Disney wants. Sure, they can fill them mostly but only after offering big discounts.
But I also suspect Disney is listening to feedback from members. Members have told them they don’t like walking (which has very little impact on Disneys bottom line). And members have also told Disney that they are frustrated that they cannot get the most popular rooms because these are being listed on commercial
DVC rental websites.
Disney has said they are looking into both. In other words, it’s not only about the financial impact on Disney.