I think https://en.wikipedia.org/wiki/Existential_risk_from_artifici... has much better arguments than the LessWrong sources in other comments, and they weren't written by Big Tech CEOs.

Also "my product will kill you and everyone you care about" is not as great a marketing strategy as you seem to imply, and Big Tech CEOs are not talking about risks anymore. They currently say things like "we'll all be so rich that we won't need to work and we will have to find meaning without jobs"