If I had to guess, it successfully blocks them some 99%+ of the time, but relies on a anti-spam filter that can fail independently from the rest of the site.
And there are probably countless bot accounts with some token maturity, like not-green one here, that intermittently test the status and then quickly unleash spam floods if a gap is detected.
It's the only way to explain how little we see spam here, on a extremely high-traffic, high-value site with trivial signup and few apparent safeguards.
And there are probably countless bot accounts with some token maturity, like not-green one here, that intermittently test the status and then quickly unleash spam floods if a gap is detected.
It's the only way to explain how little we see spam here, on a extremely high-traffic, high-value site with trivial signup and few apparent safeguards.