That's true—there are still some places where such data can be used, even without targeted advertising. However, from everything I can see, targeted advertisin

That's true—there are still some places where such data can be used, even without targeted advertising. However, from everything I can see, targeted advertising is massively broader, and if it is eliminated, a large percentage of the companies currently collecting the data will lose their primary reasons for doing so. The car, air, and insurance companies that might still want to buy it will not be enough to sustain nearly the kind of industry around collecting it that exists now. It is even very possible that the precipitous drop of money in the system will cause its collapse, even if those few industries might still prefer to have access to the data.