[modeless]

There aren't enough customers to justify building something like Starship, so SpaceX created their own biggest customer with Starlink.

They are also hoping to provide Earth-to-Earth passenger service to compete with airlines on long distance routes, which would be orders of magnitude more launches than any other use. It seems quite unlikely that they could compete on safety though.

[m4rtink]

Not enough customers yet - if they can get it working its just a total money printer. Orbital refueling, tourism, cheap microgravity research, manufacturing and material processing or even early solar farms and habitats!

Or you might even just start by launching 20 tons of coffee beans, roasting them in orbit and selling them as "Space Coffee" - it migh still be worth it with the per launch costs they have mentioned.