We should also consider that Apple’s solution is a way to distinguish between human vs. Non human users on an Apple device. It doesn’t allow a service to randomly lockout browsers and/or OS (which Google’s proposal does), just that if you’re already on your Apple device, you don’t have to do a “verify I’m a human” captcha.
It's also in the way Apple allows its use; however that's not as strong. Apple has positioned this as a way to prevent CAPTCHAs from reaching the customer. Apple is interjecting with the provider and saying Hey, trust us. We can prove its a human because they're saying they're on iPhone. They're not positioning this as a way to deny service. Only to speed up access.
Remember Net Neutrality? Pepperidge Farm remembers.