[chrismorgan]

Telling humans and computers apart was never the purpose of CAPTCHAs, only how they initially worked. The name has been a complete misnomer for at least a decade now. Its actual purpose is, and has always been, abuse prevention. Has it been successful? Some yes, some no, and a lot of collateral damage. Its mode of operation now looks a lot like inscrutable blacklisting for some plus inconvenience and bad rate limiting for the rest.

[j16sdiz]

> was never the purpose of CAPTCHAs,

TCHA of CAPTCHA is literally "tell computer human apart"

[chrismorgan]

You ignored the emphasis and the rest of the sentence. And the rest of the comment.

(Also, the T was nominally Turing rather than telling.)

[olyjohn]

How does a human abuse a website, and how does a CAPTCHA stop a human from abusing a website when it's designed to let a human in? If it doesn't stop humans from abusing the site, then it must stop... computers from abusing the site. And it stops computers by using the CAPTCHA to tell apart a human and a computer? Am I wrong here?

[chrismorgan]

I can tell you don’t live in a network Cloudflare hates.

[olyjohn]

I get hit with them all the time. That doesn't answer how does a human abuse a website? Hitting F5 on the keyboard 1000 times?

[chrismorgan]

Abuse isn’t just about inducing CPU or network traffic load (in fact I doubt that was even considered when CAPTCHA was first invented). It’s spam, fraud, that kind of thing. A lot of it is bot-perpetrated, but quite a bit is by humans too.