Rich people selling stuff to other rich people is just moving wealth around, it does not generate wealth.
I sell you stuff worth 5 billion, you give me 5 billion. Nothing happened. Maybe you even consume the product so there is less wealth.
Only labor can generate value. Work is what transforms a thing into another thing that has more value than before. Machines and AI do not create value.
You might wonder what would happen if they had an general AI, maybe actual autonomous robots? Would those create value? Well, at first whoever got the first AGI would get incredibly rich but if everyone had access to that tech, the prices for everything that can produced with it would plummet down until they are the cost of running the AI.
Rich people get richer by employing poor people. So they can extract the value they produce. If they don't employ anyone, they are not making any profit. (Well for actual free markets, you can of course make profit being a monopolist and stuff or just do crime.)
So yes, rich people are screwed. That is why they buy bunkers in New Zealand. That is why we see the rise of fascism, because they will have to tighten the screws to keep the ship running a little while longer.