Not OP, but I think the analogy to what is happening to online privacy would be if you were asked to identify yourself at every location: the grocery store, the farmers market, the corner park, the trail along the river; and all of those checkpoints were aggregated and sold, meaning that someone who might not have your best interests at heart could use your travel timeline against you, to advertise to you, to sue you, to charge you with a crime, to destroy your public reputation.