There are some dangerous jobs out there, and I can perhaps accept the argument that most 15 year olds don't have the agency to sign up for that - although as a matter of practicality, having grown up poor, I know a lot of people who ended up better off working the kinds of jobs that journalists and the regulators now frown upon.
You can make abstract arguments about how in a post-scarcity utopia, no person should ever have to work. But we're not there now and you don't get there by preventing people from working before that vision of a 3D-printed, AI-based future can be realized.
For now, work is inevitable for most; so what's wrong about being paid a living wage for classifying content in front of your computer on your own schedule? As a teenager, I'd have loved that. And I was exposed to content far more vile than anything this gig could've thrown at me.