Google captchas appears (to me) to be designed to identify individuals, not to separate anonymous users from machines. Google want to know exactly who you are, when they harvest your visits and behavior on almost all sites on the Internet.
I don't understand what this has to do with the fact that I repeatedly am having to prove that I'm not a bot despite doing nothing that ought to be triggering Captcha checks.
But hey, I guess mentioning this simple observation is worthy of numerous downvotes here. Always lovely.