That is their whole point. As an alternative Captcha Method, they double the risk of false positives being abused by bots but likely due to anti-discrimination laws against the disabled, they are necessary. The solution: make them impossible to solve so you follow the law without exposing you to any risk of false positives. After all, who's gonna believe a cripple that googles captchas are impossible. Must be their fault, they are disabled after all!

I wonder if captcha really work as intended.

https://cosmicskeptic.github.io/blog/captchas-dont-solve-any...

Captchas are an alternative to pervasive tracking cookies.

Google could look at your web browsing history over the past 10 years and every search you've done and decide based on that that you aren't a bot.

But people don't like long term tracking like that, so instead they need extra info to figure out if you're a bit or not... Hence a captcha.

At the very least, there should be a prompt how many numbers to type in...

Sounds like "377071" is the correct response.

It's unusual, since people who aren't native English speakers don't say "O" for zero. Plus there are a few phantom numbers...

And if you knew you were listening for 6 numeric digits, as someone who regularly completes these captchas would, its not too hard.

google captcha is an absolute no-no since it does not work with noscript/basic (x)html browsers. They can download/play an audio file and send back user input in an html form thru TLS.