Yup. This quote jumped out at me: >>“Furthermore the bots’ solving times are significantly lower in all cases, except reCAPTCHA, where human solving time of 1

Yup. This quote jumped out at me: >>“Furthermore the bots’ solving times are significantly lower in all cases, except reCAPTCHA, where human solving time of 18 seconds is nearly similar to the bots’ time of 17.5 seconds.” This is currently an obvious tell for the standard CAPTCHAs, as you mentioned, "performing at a superhuman level". However, it's an easy bot behavioral fix, so.... what is the next step? Offer a game of chess and look for a human the playing style? Seems you'd have to offer a menu of games, but not "Global Thermo...."