If you can't pass the captcha, you need to ask yourself if you are really a human being or if you have just been programmed to believe that you are.

It's not a loop, it's just seeing how much free labeling it can shake out of you.

Depending on the implementation, that's intentional if you fail the check for whatever reason. It doesn't return an error status or page to allow what it thinks is the automated attacker from trying another approach, it just loops you through the process indefinitely.

I abandon as soon as I see Cloudflare, since my experience has shown that it seldom works correctly and ends up wasting my time anyway.