Assuming such a lawless state of affairs, having a large constellation of satellites in LEO already could be used to prevent competition from reaching orbit to challenge you. I am not sure many people have noticed, but in launching thousands of Starlink satellites, SpaceX has demonstrated their ability to implement the SDI/Star Wars proposal Brilliant Pebbles, which called for a thousand or more kinetic interceptors hanging out in LEO, waiting for enemy rocket launches to crash into. At the time, Brilliant Pebbles was an absurd proposal because it called for thousands of satellites, but SpaceX has already demonstrated that ability. They can already launch 60 satellites per launch, and apparently have plans to increase that several times over.

(It has occurred to me that Starlink might secretly be a Brilliant Pebbles installation already, waiting to be revealed as such if a major war were to break out. However I believe the thrusters on extant Starlink satellites are too weak for this. And they don't have the sensor suites for it either, at least officially.)