There's something no one seems to be talking about
this isn't limited to your browser
It runs at the highest ring of security on your processor. It could mean it locks you to OEM Android, iOS, or Windows. It could be extended to look at your app list, dns settings, potentially even tell if the device is using a vpn
it could be paired with kosa to use biometrics to verify identity
And it would be shocking if cloudflare didn't implement this - it would save them a ton of processing. It's likely it would be a default setting - this would apply to large swaths of the Internet, not just Google services