The main issue is that if a goal of a general artificial intelligence is not aligned with the best interest of humans.

Think about ants and humans. If we want to build a road, we don't really care about the ants that were living there.

An AI can affect the real world through the internet. Imagine all the services available now, and that you can pay with Bitcoin, plus emails, plus social engineering, etc. All the scams in the world are nothing compared to what an AI can do.

nullama

bitcoin

Your opinion about AI and jobs

I was at a some event last week and met this guy who said that it's all lost, basically the machines will completely annihilate us. We should just wait patiently. He mentioned names, research papers, tools, etc. I think he watched too much Terminator. 

Life and reality seem to be much more balanced though and while AI could indeed imply a future with dangers ahead, it could also mean possibilities and openings we can't even start to imagine.