“Developers forecast that only around 10-30% of users will actually opt-in to having their data collected, making it much harder for advertisers to target potential Apple customers without as much access to their data.”
Apple is about to ask iPhone users one question. Do you want this app to track you? Facebook expects most people to say no, so it is getting its own pop-up in first. Facebook calls this protecting small businesses. If 70% to 90% of users refuse tracking when asked, they never wanted it.