> the companies owning and operating those AIs would go out of business as no one would be able to afford the products made by the AIs

What do you think money is...?

Money is a way to indirectly trade labour and goods. If a job is automated, that labour doesn't disappear into the aether, it's still in the tradable pot of total goods and services. You cannot empty a pot by filling it. A world where a company though automation has made there nobody else to productively sell to is a world where _by definition_ they own all the output that they could otherwise have traded for.