Oh God.. This is not how captcha works...

Why not? It slows down most of the spam. Even telling people to type in a fixed word actually works.

Besides, it's also accessible. When even average people struggle with "real" captchas, they become insurmountable for impaired people - and that in turn makes them disabled.

@Fast-Nop This could be easily bypassed with trivial coding which defeats the purpose of CAPTCHA.

@BlueSky yeah, it could, but it won't if the target isn't worth the effort.

Machine learning defeats almost every capcha