There are several other use cases that Starship is well optimized for. Not surprisingly it's also fairly optimal for building large LEO constellations, It's a little bit large for the current Starlink satellite size, but if the Starlink satellites get significantly larger and more capable, Starship will be fairly optimal.
Given SpaceX's business, it seems safe to assume that Starlink was a design goal with at least a similar priority to the Mars goal.
Another use case it'd work fabulous for would be a LEO space hotel business.
Finally, it's also a great rocket for any use case that involves returning large masses, even if the return is from higher than LEO. Yes, it'll be a thirsty beast requiring many refuelling trips, but the tyranny of the rocket equation makes it hard to do any better. If you want to return dozens of tons from the moon or elsewhere you'd be hard pressed to do better than Starship.
Given SpaceX's business, it seems safe to assume that Starlink was a design goal with at least a similar priority to the Mars goal.
Another use case it'd work fabulous for would be a LEO space hotel business.
Finally, it's also a great rocket for any use case that involves returning large masses, even if the return is from higher than LEO. Yes, it'll be a thirsty beast requiring many refuelling trips, but the tyranny of the rocket equation makes it hard to do any better. If you want to return dozens of tons from the moon or elsewhere you'd be hard pressed to do better than Starship.