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The name is why.

A CAPTCHA is there specifically to stop machines, allow humans.

You're allowed in, your bot isn't.

The only thing the name does is tell that it's not a very good test?

A sign on a door saying "no dogs" cannot (probably) be read by a dog and does not physically exclude a dog.

It does make it (depending on jurisdiction) trespass to enter with a dog, unless there is some mitigation e.g. guide dog.