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A standard form tag such as `<input type="captcha">` won't exist. Browsers are not to be trusted to self-regulate a Captcha service.

Without getting into specific examples, there are browser extensions on the market that already employ sneaky techniques for solving Captchas programmatically. A field such as this can easily be "blanked" by any such extension or browser to have zero functionality.

I do want to speak to one service that is similar in function to reCaptcha: Android's [SafetyNet](https://developer.android.com/training/safetynet/recaptcha). This very much is a drop-in solution, just written in Android-native code instead of HTML. It functions under the assumption that most users are using an unrooted Android device and are thus "trusted."

Again, without linking to examples and perhaps falling afoul of community guidelines, a rooted custom ROM Android device can blank this feature of the Android API.