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That’s literally not a captcha, that’s “AI” training. You could probably input anything.
They can produce an unlimited number of CGI challenges and know what is correct. Collecting the AI training data from users only makes sense for classifying images from the real world. Even then, Google’s reCaptcha checks if you’re consistent with other users so you’re unlikely to pass with a random answer.
In some cases they’re testing/training for the most common solutions human use for a problem with multiple paths and choices.
It’s part of trying to make them seem more human-like and as if they have general intelligence. And not just give the optimal and computer calculated solution, or the solution one or a few programmers think is the common solution. It needs data.
And if it’s one of those who actually check, but has multiple paths, do the convoluted one(or just refresh).