hCaptcha is more focused on technical solutions to privacy that minimize required trust. A privacy policy is one thing, but a mathematical guarantee is quite another.

We are working through the IETF and directly with browser makers to support provably private options like Privacy Pass, and are currently the only CAPTCHA service to support this.

Similarly, on the enterprise side we offer various technical options to let our enterprise customers guarantee exactly what data we can and cannot see.

(disclaimer: work there, comments not official, etc.)

How does support for Privacy Pass interact with services that pay humans pennies per thousands of captcha solves? Wouldn't it be easy to buy a ton of these blinded tokens then have an extension that provides them on demand to the captcha service?