I remember a Yahoo hackday from around 2009 where one of the teams created a captcha that required you to match photos to tags. Another team made a program that could look at a photo and assign tags. Mutually assured destruction.
Lo and behold the wonder that is adversarial AI - 11 years later we can automate this. My guess is that Google is quite happy about open source Recaptcha solvers. Delicious fodder for improving the adversary.