But even if not, there's still value in raising the barrier to entry. For example, you can buy 1000 reCaptcha solves for $1-2 from various captcha-solver services. And yet that $0.001-per-request fee does discourage mass-scale bot attacks.

I know, people will slavishly knuckle under, but let me dream for a few minutes.

Does the iPhone recaptcha app force you to login with a Google account? Seems we didn't need ID verification for the web to lose all anonymity.

If Google Play services is listed as a requirement, that implies that a "certified Android" device capable of Play Integrity attestation is required, since that's the only officially supported way to obtain Google Play services. On consumer-facing support articles like this, they don't tend to get into the nitty gritty details like what APIs are being used. If MEETS_DEVICE_INTEGRITY is required, that would probably not be explicitly listed here.

E.g. the consumer documentation for Google Pay just says you need a "certified" Android device and a screen lock set up: https://support.google.com/wallet/answer/12200245

(Yes, if you go deep into the FAQ at the end it eventually states that if you rooted your phone, you can't use tap to pay, but that requirement is implied by the certification requirement [1].)

In Google's eyes, and in the eyes of the law due to trademarks filed by Google, Android == Google Android.

This feature would make little sense if it's not using device attestation because otherwise it would be easy to spoof. I expect that it will initially not use it, and they will start A/B testing device attestation in the coming years.

[1] Expand "What to do if you see device is not certified" -> "Reset device to fix issue" https://support.google.com/android/answer/7165974