I’m not sure that is always a valid CAPTCHA and not one being proxied to you for solving it on behalf of some bot (presumably a crawler).
replyI don't know. I think people would notice if Google were being MITM'd on Tor.
replyYou don’t need to MITM it, this was a common pattern for a long time (not sure it still works though). There was no origin verification so you could just use a different site ID and have people respond to captchas you encountered on that site.
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