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To eliminate reCAPTCHA from Firebase Auth (OTP), follow these steps:

1. Go to the Firebase Console and select your project.
2. Click on the Authentication option from the left-side menu.
3. Select the Sign-in method tab.
4. In the Sign-in providers section, enable the phone authentication option if it is not already enabled.
5. Click on the Configure button next to the phone authentication option.
6. Scroll down to the Security section, and disable the Invisible reCAPTCHA option.
7. Click on the Save button to save the changes.

By disabling the Invisible reCAPTCHA option, you will eliminate the need for users to prove that they are not robots by selecting images or entering CAPTCHA codes.