This won't work because guess what? Bad actors have money and means to buy as many devices as needed through individuals. Most of the abuse that CloudFlare pro

This won't work because guess what? Bad actors have money and means to buy as many devices as needed through individuals. Most of the abuse that CloudFlare protects from is also usually illegal. And those taking risk of doing something illegal usually do it because it's highly profitable so making some authentification devices a bit more expensive won't make any difference.