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Why am I prompted for a CAPTCHA when posting even though I didn't trip any of the rate limits for CAPTCHAs documented in The Complete Rate-Limiting Guide?

  • 6
    Because we're on to your kind, robot. – Won't May 4 '18 at 20:12
  • Damn, busted again! – Moab May 4 '18 at 21:10
  • You're probably associated with a sketchy IP (proxy?) that has been know previously to produce spam... or something like that. When I used to used proxies, Google would hit me with captchas occasionally when I tried to do a search. Are you on University wifi by chance? – Carcigenicate May 5 '18 at 11:20
  • Nah, tethered to my phone. – Moab May 5 '18 at 15:51
  • did you take too long? Happens to me sometimes. I mean, checking to see I'm human? That's speciesist. – Journeyman Geek May 6 '18 at 4:55
  • @JourneymanGeek Maximum times were removed a long time ago. – Sonic the Anonymous Hedgehog May 6 '18 at 7:41
  • Pretty sure I got hit by it semi recently, when I wandered off halfway while writing an answer, and wandered back to finish it off. – Journeyman Geek May 6 '18 at 7:43
  • @SonictheInclusiveHedgehog thanks for saving my question. – Moab May 6 '18 at 16:54
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According to the comments, you are tethering your phone.

It is likely that your phone's data provider is doing carrier-grade NAT, which makes you share your IP address with a lot of other users at once, and makes you look less like a "real person." There is (probably) nothing you can do about this other than changing to a different carrier or using a different internet connection.

However, this answer suggests that CAPTCHAs can also be triggered by trying to do things too often or too quickly, as a form of rate-limiting. If that's the case for you, then you may be able to improve the situation by slowing down.

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