According to two security researchers who’ve studied reCaptcha, one of the ways that Google determines whether you’re a malicious user or not is whether you already have a Google cookie installed on your browser. It’s the same cookie that allows you to open new tabs in your browser and not have to re-log in to your Google account every time. But according to Mohamed Akrout, a computer science PhD student at the University of Toronto who has studied reCaptcha, it appears that Google is also using its cookies to determine whether someone is a human in reCaptcha v3 tests. Akrout wrote in an April paper about how reCaptcha v3 simulations that ran on a browser with a connected Google account received lower risk scores than browsers without a connected Google account. “If you have a Google account it’s more likely you are human,” he says. Google did not respond to questions about the role that Google cookies play in reCaptcha.
That's not even the worst of it. For those of you who want extra privacy there are worse things behind the scenes.
With reCaptcha v3, technology consultant Marcos Perona and Akrout’s tests both found that their reCaptcha scores were always low risk when they visited a test website on a browser where they were already logged into a Google account. Alternatively, if they went to the test website from a private browser like Tor or a VPN, their scores were high risk.
This entire mess is because surveillance replaced a task that could take a few seconds. Sometimes going the more advanced tech route isn't the best path. What if people started training AI to imitate the patterns reCaptcha v3 is looking for. What then? I assume it'd be harder for a machine to lean to beat a Captcha than beating another algorithm that Google is probably working really hard to keep as a secret.