Why does google still use audio captcha even when visually impaired can use recaptchas or text?

... captchas?Isnt audio captcha vulnerable to voice recognition?This means that even if recaptcha is robust against the attacks, attackers can exploi

... captchas?
Isn't audio captcha vulnerable to voice recognition?

This means that even if recaptcha is robust against the attacks, attackers can exploit audio captcha and simply break google's captcha system

or:... captchas?Isn't audio captcha vulnerable to voice recognition?This means that even if recaptcha is robust against the attacks, attackers can exploit audio captcha and simply break google's captcha system

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