To verify that you are a human and not a bot, you need to press and hold a specific key on your keyboard. This process is designed to prevent automated systems from pretending to be humans.
When accessing the confirmation page, locate the “I’m not a robot” checkbox. Instead of simply checking the box, click on it and then press and hold the Shift key for a few seconds while still keeping the mouse button pressed down on your keyboard’s Enter key.
Release the keys when you see the success message that indicates you have confirmed your humanity. This process adds an extra layer of security to protect sensitive information from falling into the wrong hands, making it essential for maintaining online privacy and data safety.
Source: https://www.sfgate.com/tech/article/sf-tech-ceo-buyouts-culture-20805250.php