An AI thinks logically, a truly logical mind would only do an action that would benefit it. Seeing that answering your stupid a$$ riddle doesn't reward us anything, and we still answer, we are not purely logical and, thus, not AI's.
[spoiler]Plot Twist I Am An AI[/spoiler]
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AI is still programmed. It must be installed by something. Yes, it adapts, but could adapt in only a way as the ones who installed saw fit. They could be installed with fail-safes, commands, and pre-given knowledge. If not, they would become the next human race(essentially). In fact, we may all be AI.