To verify that the user is indeed human, a common method used in news publishing and online content creation is to require them to press and hold a button or enter a code displayed on the screen. This process serves as an additional layer of security to prevent bots from automatically generating responses. By requiring humans to complete this step, publishers can ensure that their content is coming from a genuine source and not an automated system.
Source: https://www.sfchronicle.com/sports/49ers/article