I think their claim they can make, assuming their evidence is true, is
"AI needs $6T in annual revenue for every investment in AI to be profitable"
I think some people will make a lot of money and more people will lose a lot of money.
Most of those investing know this, they are taking the risk of losing a lot to attempt to be one of the ones that make a lot.
A lot of early internet tech companies went bust, a few became extremely successful. At the time I would see high valuations and ask "Yes, but how do they make money". Most of those with an unclear answer to that question are not around now. The ones who had a tangible plan to make money, even if they were making a loss at the time, tended to survive.
There is a lot of Dumb money going into AI, when that is the dumb money of wealthy individuals, I am more than happy to let them receive no return while paying for infrastructure. There's a problem when the dumb money comes from dumb individuals who are routing money from others who do not have a say in how it gets invested.
That is not an AI specific problem, that is a problem where people can make decisions where others carry the risk without their consent. That is the problem that needs to be met head on.