alt Hacker NewsKinda off topic question to google - when I do this labour of tagging your data so you let me use the internet - should I click on every box that has parts of the bus? Even if it's like one pixel?
Follow up question - why ask people to work when you can just say "pay 1 shmeckel to view this content" and then use this money to pay for data taggers?
Thank you for letting me use your internet!
Recaptcha contains a whole maximally obfuscated virtual machine with its own bytecode language. It measures your mouse movement, clicks, timing, cadence, hesitation, consistency, tile clicking order, etc.
Ambiguous tiles are deliberately placed because the behavior they elicit from humans can be used to discern them from bots.