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Captcha is an alternative to small fee, cause solving it automatically costs money.

Real fee will scare away almost all amateur developers and almost all professional developers who don’t already have a business account available.

I run a big web property with great SEO ranking, and captcha definitely does not deter the spam. A lot of this spam is posted by actual humans.

Clearly, captcha only works in the same budget category. If that spam “business” endures hiring humans, it will easily swallow small fees too.