Captcha is like locks on soap shelves. It's friction on people who want to buy soap and can be trivially defeated if you want to steal the soap.
Just load a captcha-blocked page in a fresh browser with no google accounts every being used - you got like a 1% chance of getting through. Login to google, and BOOM you're in.
"In terms of cost, we estimate that – during over 13 years of its deployment – 819 million hours of human time has been spent on reCAPTCHA, which corresponds to at least $6.1 billion USD in wages. Traffic resulting from reCAPTCHA consumed 134 Petabytes of bandwidth, which translates into about 7.5 million kWhs of energy, corresponding to 7.5 million pounds of CO2. In addition, Google has potentially profited $888 billion USD from cookies and $8.75-32.3 billion USD per each sale of their total labeled data set."