Yes, in a perfect world, they would simply choose to not track. We (I'm a co-author on the research) chose to change things such that we don't need to rely on c

Yes, in a perfect world, they would simply choose to not track. We (I'm a co-author on the research) chose to change things such that we don't need to rely on carrier benevolence. Our fix changes the architecture to nullify an identity that has long been used to track users. The data has simply been available for them to sell as a byproduct of running a network.