This one sounds less problematic for blind people than reCAPTCHA, which relied on a visual challenge. Especially since google or the screen reader software can easily add a browser extension that forwards the challenge to the phone removing the need for scanning a QR code.

The real problems with this technology are control (need a google approved phone) and privacy/tracking.

Blind people need to start suing at least in America the ADA is far easier to win against large companies than in the UK as the equality act is treated vastly weaker by judges than if someone presented a religion or race lawsuit.

America is the only place to take down big tech discrimination.

That is a cost that our future authoritarian world leader has decided is more than acceptable.