The GDP of UAE is 500B, 1.1T in Saudi, and 230B in Qatar. It'd take them decades to provide that kind of money.
All the sovereign wealth funds of the entire Arab Gulf hold less than $3 trillion, saved over decades. And mostly illiquid assets where you can get a 20-30% haircut if you liquidate quickly. Even if they wanted to, they can't even give him $100b/yr for 10 years (i.e., $1 trillion). It's just not feasible or possible. They don't have it anywhere.
Exactly. Even the US would have to dip into their savings to show that kind of money within a few years.
It'd probably take decades to build that many fabs anyways.