Maybe a dumb question, but how is this suppose to work for iphone users? They wont have google play, and it seems like android/google play is required here? There is no way they would cut out such a huge chunk of the market.
Apple has device attestation deployed like one year before Google even proposed it: https://httptoolkit.com/blog/apple-private-access-tokens-att...
The claim is that an iPad/iPhone will also work. Not that that makes it acceptable; if anything, it's worse, because if it were Google Play only it'd be more obvious how unacceptable it is, whereas catering to the duopoly makes it less obvious how much it excludes people and builds a reliance on proprietary systems.
iPhones have attestation too: https://developer.apple.com/documentation/devicecheck/establ...
It'll just be more clunky because you have to install their app.
iPhone users will have to install the "reCAPTCHA" app. https://apps.apple.com/us/app/recaptcha/id6746882749
This is detailed at https://support.google.com/recaptcha/answer/16609652