It doesn't need to be an existential threat to humanity - it's an existential threat to their business. They need agentic workflows to work for their business to become profitable. So pouring money into the "no engineers write code anymore, only agents" model is at once R&D, QA, product development, and advertising. They can spend as much of their investors' money on this as they have to because if they can't (sustainably) sell this vision to other companies, their company collapses.