Reviewers saying that this add-on doesn't work most probably do not understand how it is supposed to work. They think this is a magical add-on that just removes any need to solve a captcha, but that's not the case.
This add-on allows you to solve a captcha first to fill up 30 passes (for each captcha), then use these passes when you encounter captchas as you surf.
This add-on does not work on Google's captchas, it is designed for hCaptcha only, which is not very wide spread, but Cloudflare uses it natively, and Cloudflare IS widely-spread..

Good

As a VPN service user, I can say that this add-on saved me so much annoyance with captchas ! Hopefully concerns about privacy that I can read in some comments are exagerrated.

This plugin is kinda annoying because you need to create both hCaptcha and Cloudflare tokens, but there's no way to actually know which one you need because Cloudflare uses hCaptcha anyway.

Update: This plugin also just doesn't seem to work half of the time. I literally only have it installed because my bank's website nags me with hCaptcha constantly. But now, even when I have both hCaptcha and Cloudflare tokens, I still have to fill out a captcha anyway.

The internet seriously needs to find a better way of dealing with things than applying captchas to everything.