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Like most of these overly ambitious projects, the issue isn't the initial cost, but the upkeep. Even in the unlikely case that they manage to build the city, I expect it to look like a futuristic slum within a few decades.
Furthermore, one of the reasons that "normal" cities are so successful is that they can change (albeit slowly) to meet changing needs. The planned cities often leave out many human needs in their design because of the prejudices of the planners or stakeholders, and are much more difficult to modify.
I would love to be proved wrong on this.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
The world (minus Bolsonaro): We need to be more aware of the environment and reduce pollution or we're going to have a problem.
Saudi Arabia: Hold my beer (oops, that will get you beheaded or something) soft drink.