....based on reports about what other other Google cookies reveal, it could be enough to identify you as an individual, although probably not by name, what you bought, and where you browsed after you left the site where you got the reCaptcha cookie, even days or weeks later.
Wow! No wonder Safari says "Ixnay on that". Thanks Apple. It looks like the sites that use reCaptcha are forcing a technological step backwards....that is, phone them.
