In the modern economy the best way to make a lot of money is to make a product that a lot of people are willing to pay money for. You can make some money scamming people, but nothing close to the money you'd make by creating the next iphone-level invention.

Also, that's not a problem of AI alignment, that's a problem of human alignment. The same problem applies to the current world or the world a thousand years ago.

But in a sense I do agree; the biggest threat from AI is not that it will go Ultron, but that humans will use it to fight our own petty struggles. Future armies will be run by AI, and weapons of war will be even more terrifying than now.