I wonder how many people here complaining about privacy have frequent flyer cards or valued customer cards?
Opting into a FF program is voluntarily exchanging your personal info and loyalty to a brand for benefits in pricing. How is that the same as an OS uploading your information from a local search by default in an opt-out model? I'm really not trying to be snarky, I genuinely think I'm missing some point here.
What I understand about the matter, the information sent is a regularly regenerated random ID and some machine information. Compare that with a Tesco's Clubcard or Walmart's Credit Card: given the information you provide them with, these companies may know what you eat, how much you spend, where you live. They can judge your income, they can project your financial situation into the future, and they probably know when you go on holiday. And I don't really think people opting in on those products really understand these implications.
I think this issue is overblown only due to it belonging in the area, where most commenters here work. As I see it, there are business practices way more harmful to privacy than this, but are happily ignored by the pop-privacy crowd just because they are convenient and have been in place for a long time.