I got it working with using the following filters in 'my filters' (dynamic). The vast majority of websites using Google captcha specifically
(competitors need their own filterset!) work. Sometimes you come across websites that link these domains through their own proxy or a 3p function, call, CDN or whatever they can come up with. They would need some interaction.
In those cases usually either [a.] need to find the 3p domain and noop it, or [b.] noop google.com and gstatic for that website. But that all depends on the websites you visit...
Specifically for Google Captcha:
Code:
* https://www.google.com/recaptcha/api * noop
* https://www.google.com/js/bg/ script noop
* https://www.gstatic.com/recaptcha/releases script noop
* https://www.recaptcha.net/recaptcha/api script noop
To test it, go to a website you know that uses Google Captcha, or a testing website like
patrickhlauke.github.io/recaptcha/ and open the uBlock logger, filter on Blocked. If it doesn't work you will have a very easy time through that method with the above dynamic filters (my filters tab) to add other domains to make it work.
Important notice: in my case due to me blocking 3p-scripts, I had to add this to make Google Captcha work. If it doesn't work, the method explained, and the logger says that it is still blocked. Then it's most likely a filterlist!