hCaptcha's accessibility is poor. You have to make an account to login and set a cookie if you're unable to work with their image captcha.

HCaptcha founder here.

We think this is by far the most accessible solution: for example, audio captchas discriminate against all the people with auditory processing difficulties as well as some visual impairment.

There doesn't seem to be anywhere on the widget that actually tells people to go to your website and register.