Unfortunately, like the real cancer, it has too many forms and too many causes to have a simple way of eradicating it. And unlike the real cancer, nobody is seriously investing into fixing it. Maybe some kind of paradigm shift is required to make the approach of "we hold data about you that you need hostage so we could sell you stuff and control your behavior" no longer acceptable. After all, you wouldn't accept if the car dealer would be the only one who had access to your car mileage or maintenance records, and would only tell you any information about it after you listened to the sales pitch. People would be grabbing torches and pitchforks if that happened. But for other businesses the same behavior is seen as OK.