The question of how it’s done has already been answered in this thread but on the topic of why you should care I suppose it all depends on your own stake in the matter. If you have nothing to lose from sharing your information then it’s fine for the most part, often times the price of convenience is limited privacy in the modern world. If you have much to lose, say money, research, fragile information, or believe that your behavior can be used to exploit you, like say a marketplace charging you more than other consumers based on your larger income or lesser knowledge, then you might not want this information to be available to any buyer, and I mean literally any buyer. I can go and buy googles user data info right now and up charge unknowing people for products I can import for dollars, and I know there not knowledgeable because I have all their data.
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