Ostensibly it's to help programmers, or writers, or lawyers, or whomever. But those are just the users of AI.
The owners and buyers of AI at a company level are developing and using it to push down payroll expenses. That's it. It's to avoid paying people, and providing them benefits. Even if you fire 50% of your employees, realize it was a terrible mistake, and hire most of them back, it's a net reduction in payroll costs.