My word is my passport

Sometimes, when you fill out a form on the Internet, it asks you for a "word verification," by which it asks you to type the letters it displays on the screen. This is so that a computer program can't just sign up unlimited times for whatever it is you are doing. But if the only purpose is to verify that you are a human, why does it make the verification display so hard to read? The letters are usually wavy and camouflaged behind other wavy lines.

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