I don't know, it is clear that Google is getting free labor out of users solving their captchas.
However, I disagree with captchas being ineffective. If captchas were so ineffective there won't be sites dedicated to having people in developing countries solve them.
It is very easy to make a script that makes accounts by sending post requests without a captchas. It requires little skill. You can see this with new lemmy instances being filled with spam until the admin adds a captcha or questionnaire.
