I'm not even sure we're talking about the same captcha. It was just an image grid with some symbols overlaid each cell and it wanted me to pick out which cell had two identical symbols. I found it annoying because it was different from other captcha's I'd seen before so I had to actually mentally process what it was asking, but I certainly didn't find it difficult or inaccessible.
Some audio captchas are just impossible tho, like recaptcha where it's simply impossible to hear what they're saying.
I wish google cared about people with reduced eyesight and listening ability, but no, it doesn't make them any money.