Earlier quoted context omitted.
Having to do free work for Google is more than weird for me. For this reason unless the page is really important I end up closing the tab. If it was for open service (such as OpenStreetMap) it would be a different matter though.
How is that "free work"? Automated usage can threaten a site's bottom-line, and even its existence. A site resorts to Google's CAPTCHA's service because they don't have the money to build their own detector. It's not a service that was free for Google to create. edit: Also worth noting that some of this "free work" that users do for Google is used to improve bot-detection overall. The comment to this blog post (the p…
Does a sweet pastry count as a cake? Is this stretch of water a river, a lake or the sea? Are those trees I see in the distance on this photo of a mountain? Does the front of a restaurant or a veterinary surgery count as a "storefront"? As a British English speaker I had to guess at that last one, and some of the others seem culturally dependent too.
Or, my personal nemesis, the ones which ask you to select the squares containing road signs, and there's always a couple of squares containing a 3-pixel strip of the very edge of the road sign, and you don't know whether you're supposed to count those or not.