Captcha and Colour Blindness

Hello - I am one of the 7% of men and 0.5% of women who are colour blind -
until today I have never had a problem reading Captcha numbers and letters.
But today, I came across several in a row I could not read, due to my
colour blindness.

You should be aware that Adobe has published a colour palette that is
visible to almost all colour blind people. You should definitely be using
this - even though one can refresh the picture, why would you use something
you know will not be visible to such a large number of people in the first
place?

Many thanks
John Mathieson

https://helpx.adobe.com/creative-cloud/adobe-color-accessibility-tools.html