Sure, u won’t need to mine the moon to do this. But resources would be incredibly cheap WHEN we start mining the moon.
I disagree with the energy part though. I’m pretty sure we would need A LOT of energy to dig continent spanning tunnels. How many drills would we run out of? How much energy would be required to recycle these drills?
The point is, the resources required for Hyperloop construction would be cheaper when we uk… Increase their supply (by nuclear fusion or lunar mining). It would thus be kinda economical then, no?