Holy slippery slope, Batman. Just because you don't have a right to know everything about you, follow you home, and see what you bought elsewhere, doesn't mean I'm not allowed to observe how your [thing claiming to be a browser] behaves when it connects to my website.

If you want to make it harder to guess whether you're human or a malicious bot, you're going to find yourself clicking on more than just traffic lights and bicycles in the near future.