In addition to the larger categories of bugs that we've discussed that typically don't merit a payout, and keeping in mind that these are in addition to previously-submitted vulnerabilities, which are ineligible for payout everywhere, there are also a lot of one-offs and miscellaneous would-be vulnerabilities you should try to avoid submitting.
Other Common No-Payout Vulnerabilities
Weak or Easily Nypassed Captchas
CAPTCHA (and their successor, reCAPTCHAs) are Google-administered Turing tests designed to block bot form submission spam by asking a bot to do things (sophisticated natural language detection, image pattern recognition, performing tasks on dynamic challenges, and so on) that your average bot can&apos...