The days of CAPTCHA clusterfucks have finally come to an end. Hallelujah!
EDIT: Harsh responses, but yeah obviously I don't know enough about this. I thought it would be more of an open-source thing where anyone can integrate it as anonymously and securely as they wanted to. Still, maybe websites like LBC and Blockchain.info will start using it, which will make those cloudflare CAPTCHAs much less annoying.
Why would a market ever use Google API? it is the most government infiltrated company. Not to mention I am sure this new API uses JavaScript. Also when signing up for recaptcha you need a google account and they need to verify you own the site using the api. So you would have to tell Google you own the hidden market site.