This is reCAPTCHA v2. There's even a v3 that does not have a checkbox at all. Is just a Javascript API that gives you a score between 1.0 and 0.0 on how likely a user is a bot or not. I suspect it uses the same ideas of this one, maybe more since the article is a bit outdated.
I don't think that's the goal. Nowhere they suggest locking people out though def it is possible. The idea is that the website can choose to be more cautious about that user, requiring 2FAuth, flagging for possible credit card fraud and comment moderation. I think these are all good use cases.
It will lock me out of the websites because it requires me to enable Google Javascript code to execute, which is something I will not do. I allow very little JS to execute at all, and I don't allow any from advertising companies or entities that report to advertising companies.
I understand the reasons why sites may want to do this sort of thing, but personally, the cost of allowing this to happen in my browsing is simply too high.
https://developers.google.com/identity/protocols/OAuth2#inst...