What's your threat model? Maybe a CAPTCHA is not your only or not even a good solution. What about blind users? or with some other disability?
Think: rate-limit, IP rating/scoring, your own filter on messages, etc.
Think: rate-limit, IP rating/scoring, your own filter on messages, etc.
It just analyse the traffic and give the site owner a score [0.0 - 1.0] on how sure they are the visitor is human.
They don't explain how they calculate the score, but from my usage it's pretty accurate. They suggest to consider at first anything higher than 0.5 to be a human.
But yeah, it's probably not common for sites to 'upgrade' to v3. Recaptchas are a feature you begrudgingly add and v3 puts the onus on the product to decided what to do when there's a low score, so its pretty different.