That, and ReCAPTCHA had hellbans.
If you blocked cookies or were otherwise problematic, it would sometimes lock you out of all ReCAPTCHA-gated resources not by giving you a message describing what was happening, why, and how to fix it, but rather by simply pretending that your every attempt to solve the captcha failed. Obviously this is extremely frustrating, by design, but it gets even more so with compounding factors like "the library is closed at this hour, so I can't get a fresh connection."
The worst I've seen has been when it happens to people who aren't well equipped to guess what's happening. When my friend's younger brother got hellbanned from his PlayStation account, he spent 30 minutes trying to identify traffic lights (or whatever) and then retreated crying to his room, because he wasn't able to deduce that Google was gaslighting him. He trusted Google. They had him convinced that he was such a failure he couldn't even identify traffic lights correctly, and he was -- quite reasonably -- inconsolable for a while.
Thanks a lot, Google.