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Google's reCAPTCHAv2 is just labor exploitation, boffins say • The Register
(www.theregister.com)
So is v3 not harvesting labour like v2? I don't know the difference between the two.
Edit: this would suggest that the prospects of exploitation are low or nil: https://security.googleblog.com/2018/10/introducing-recaptcha-v3-new-way-to.html