Looking I assume not a mobile screen, but a larger non mobile display? Ok what happens if mobile phone used isn't connected to the net / hasn't any data? I assume it's a link ...

However I'd guess it sounds like it wants a second device to authenticate ... there's no way that sort of idea for security could backfire ...

Google is trying to manipulate the market [1] [1a] ...

I'd comment further but the criticism will come off as snarky.

[1] https://news.ycombinator.com/item?id=48478643

[1a] https://cybernews.com/privacy/google-qr-code-recaptcha-requi...