In 2021, parents in South Africa with children between the ages of 5 and 13 were offered an unusual deal. For every photo of their child's face, a London-based artificial intelligence firm would donate 20 South African rands, about $1, to their children's school as part of a campaign called "Share to Protect." With promises of protecting children, a little-known group of companies in an experimental corner of the tech industry known as "age assurance" has begun engaging in a massive collection of faces, opening the door to privacy risks for anyone who uses the web. The companies say their age-check tools could give parents ... peace of mind. But by scanning tens of millions of faces a year, the tools could also subject children and everyone else " to a level of inspection rarely seen on the open internet and boost the chances their personal data could be hacked, leaked or misused. Nineteen states, home to almost 140 million Americans, have passed or enacted laws requiring online age checks since the beginning of last year, including Virginia, Texas and Florida. For the companies, that's created a gold mine. But ... Alex Stamos, the former security chief of Facebook, which uses Yoti, said "most age verification systems range from 'somewhat privacy violating' to 'authoritarian nightmare.'" Some also fear that lawmakers could use the tools to bar teens from content they dislike, including First Amendment-protected speech.