A captcha so fiendish only a robot could solve it

Yes that does look like a colour blindness test.

For example: https://www.allaboutvision.com/eye-exam/color-blind-tests.ht...

Is there any evidence this is real? Seems like a joke to me.

My instinct is to say this isn't real.

The biggest hangup I get is that I think this would be trivial for a robot to solve. There's no distortion on the text, would this really pose a problem for OCR?

Beyond that, I can't remember the last time I got a captcha from Google that wasn't image classification.

I do think it's plausible someone could get a captcha that wasn't colorblind accessible. I don't think it's plausible they would literally get an eye exam for a captcha. But :shrug:, maybe I'm wrong.

Shrug. Seems ok to me. Maybe I'm a robot.