Add ReCaptcha for email

[tnrich]

@bojeil-google @prameshj

Is your feature request related to a problem? Please describe.
Currently it appears that recaptcha is only enabled for phone sign ups. There should also be a way to add it in the same way for email sign ups.

Describe the solution you'd like
Please add a recaptcha option for email sign ups.

Describe alternatives you've considered
There are no other alternatives besides trying to hack something together myself..

[prameshj]

You can achieve this with the Recaptcha Enterprise Integration - https://cloud.google.com/identity-platform/docs/recaptcha-enterprise

[christopherorea]

This only configures the platform, but is not a functionality inside FirebaseUI, not a solution

[rachelmyers]

Because you'd need to sign up for a ReCaptcha account separately, it's difficult to add this to FirebaseUI. We'll consider adding a guide for how to add this functionality to your own Auth flow outside of FirebaseUI. Thanks for the feature request.