Is there an A/B test at play? I don't see anything unusual or GPT-ish about the signup form. The only "unusable" aspect of it is the slightly-more-annoying-than-usual captcha.
And it asked me 4 times, before I gave up and just mashed random answers (and got kicked to the start).
It's silly.
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.
Are others getting something else?