Geostationary satellites are up at around 35,000 km. Starlink is about 500-600km - you can get a whole lot of hops between Starlink satellites and terminals before you're looking at the same distance.
There's talk that they might be able to use either existing terminals, or a special set of terminals to do this, without the need to deploy them in fixed locations.
They're already in talks (trials, too I think) with Airlines to equip their aircraft with terminals. I'm sure commercial shipping companies would be interested too.
There's enough of those around to provide a massive network of potential relays.
But they are deploying inter-satellite laser links on newer launches, so those will come on and provide more coverage too.