This is no worse than back in the 1960s when Ma Bell used to have its people listen in on all phone calls and write down the topics discussed on decks of index cards for each phone account. They then sold stacks of these cards to outfits like Montgomery Ward and S&H Green Stamps, which helped them to mail out coupon offers tailored for customers' interests. They only sent copies to J. Edgar Hoover when he said there was a good reason.
The U.S. Post office enhanced their revenues with a similar program steaming envelopes (note that stamps only cost a couple of cents back then, so it sure was effective at holding down prices). It was a win-win for everybody; what's the big deal?