Well, CAPTCHAs can be broken so making it as hard (for the time being) for spammers to join would be the goal.

Why not a system that askes you questions about the implicit properties of an object? Something a computer would not know but a basic English speaker would know?

Nonsensical stuff that a computer can't just parse or memorize a list of and answer (at least for a few years).

What is the color of sadness? (Blue)
What does the A stand for in EULA? (Agreement)
What is the flavor or sweat? (Salty)
What is the worst class in WoW? (Paladin)
Complete the sentence: World of _____. (Warcraft)
Complete the word: Mul(__)boxing. (ti)

Etc..... :whistling: