That's another issue I have with this article. It lists the risks, but does not provide any specific well documented examples. It (and many others privacy related) does not try to quantify them either. Driving a car, flying a plane pose risks too. Yet milions of people take the risk daily. Jumping from 10th floor is also risky and here somehow most peoply don't try it. People intuitively can evaluate the risks on their own and ultimately you cannot do that for them. If examples of negative consequences of their data being sold start appearing, they will stop using these apps by themselves. But I personaly think these risks are blown out of proportion.