The argument is almost over the top, but not quite. Dave Farrington on how Apple is somewhat complicit by aiding advertisers and trackers in Safari.
Second, behind the scenes, advertisers and data trackers exchange information about usage emanating from specific users and IP addresses. That data is sliced and diced many times over, and some trackers build a profile about your specific online habits that is then matched up with other information.
Apple is complicit and could do more.