If left unchecked, AI could evolve faster than we can control it. Societies could face mass unemployment and privacy loss. If ambition outpaces reason, AI could be used to further bias and misinformation, especially in warfare, potentially creating lethal autonomous weapons. 

AI could even achieve artificial general intelligence, or AGI, and surpass us entirely in intelligence. It could make decisions and take actions we cannot understand or follow, potentially removing us from all control.
AGI could treat us how we treat beings we deem less intelligent, like animals and insects. 

Given the current abilities of specialized narrow AI, if an AGI were created without restrictions or responsible governance, it could do everything humans do better than us, making us powerless and useless.
In such a world, the technological creations of humans could overpower us and control us, just like Frankenstein's creature.   

“If humans are no longer the most intelligent, we might cede control” (Conn, Future of Life Institute).