Critics said that while the hyperloop may be technically feasible, it still only amounts to vaporware. It’s been called a “utopian vision” that would be financially impossible to achieve. It’s one of those technologies that is also “just around the corner,” according to its boosters — despite outwardly appearing to still be years away from completion.

https://www.theverge.com/2023/12/21/24011448/hyperloop-one-shut-down-layoff-closing-elon-musk