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Google is making it mandatory to have Play Services for its next-generation reCAPTCHA system on Android.
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Your phone will need to be running Play Services version 25.41.30 or greater when the system asks you to scan a QR code for verification.
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This hurdle means that de-Googled phones will fail the verification test by default.
https://apps.apple.com/us/app/recaptcha/id6746882749?see-all=reviews
Supported Environments for reCAPTCHA Mobile Verification: https://support.google.com/recaptcha/answer/16609652