Rather, people decided that after tracking became opt-in (as it should be), that they suddenly didn't like the game rules anymore now it had turned against them

Rather, people decided that after tracking became opt-in (as it should be), that they suddenly didn't like the game rules anymore now it had turned against them, and chose to violate your privacy regardless of your choice. IE10, Safari and Firefox all did sensible things. The industry just doesn't want sensible things, it wants to violate everybody's privacy uninterrupted.