That said, I do think people should not be surprised that when they reveal pieces of information to a company that that information is used by that company in ways that they don't 100% agree with. If you give up information, you're giving up (some amount) of control over how that information is used.
Stores that have hidden charges and gotchas are reviled, just like we should be outraged by websites that sell your data without your explicit consent.
It's a bait and switch con.
At least some of the onus is on you to be more discriminate with whom you share your data. As the sibling says, assume the worst.
It's fun to expound about "how things should be" but sometimes you have to deal with "how things actually are".