One possibility:

>Safety fears as scientists make first viruses designed by AI

https://news.ycombinator.com/item?id=49200689

I work in a large finance company. If rogue AI deletes databases it will take at least a week at my company to get the minimum functionality up. Backups are done daily so a whole day's worth of changes is potentially gone. This will affect 10s of billions of dollars and up to a million people directly