1. they are selling you as a target.
2. some people, governments, groups, whatever are willing to pay a lot of money to obtain information about you.
3. why would someone pay good money to target you unless they were going to profit from doing so. are they stupid? no.
4. where does that profit come from? If some one is willing to pay $100 to target you, how are they going to recoup that money?
5. From you.
There is simply no other way this can have worked for this long without this being true.
It is a long causal change, so it is fair to ask whether there is any empirical evidence. If this is true we would expect to see ...? Well how about prices going up? Well how about in general people are less able to afford housing, food, cars, etc.
I'm speculating here, but perhaps it is predictability. There is a common time warp fantasy about being able to go back and guess the future. You go back and bet on a sports game. If I can predict what you are going to do then I can place much more profitable bets.
Do the corporations that participate in this scheme provide mutual economic benefit? Do they contribute to the common wealth or are they parasitical?
No one likes to think they have parasites. But we all do these days.