In the developing world, we've seen a leapfrog effect in telecoms - they skipped over fixed-line phones and went straight to mobile phones. It's far easier to blanket a rural area or a dense slum with 3G signal than to run wires to every house.
That poses a problem when you need fast fixed broadband - there's only so much mobile spectrum to go around, you can't really cheat the Shannon-Hartley theorem, so you end up with tight data caps and unreliable performance. Rolling out fixed infrastructure can be prohibitively expensive, so a lot of areas are stuck on mobile-only.
Low-orbit satellite broadband potentially breaks this dilemma. The low orbit provides tolerable latency (within 30ms of fixed broadband), there's an abundance of spectrum in the Ku and Ka bands and you can steer a tight beam with a phased array. Starlink and OneWeb could potentially offer a satellite broadband product that is competitive with fixed-line broadband on cost, latency and bandwidth, but that is available almost anywhere on earth. Becoming the default broadband provider for half the world's population is Kind Of A Big Deal - maybe enough of a big deal to bankroll a Mars mission.
I think there's obvious potential for this to be Kind Of A Big Deal on a purely personal level. Is your local cable monopoly absolutely terrible? Within a couple of years, it might not be a monopoly any more. Huge amounts of rural real estate becomes a heck of a lot more attractive if literally everywhere has good broadband. This might just be one of those once-in-a-generation technologies that meaningfully changes human geography.