Remember the Kzinti lesson. Anything with sufficient velocity is a weapon. Thousands of Starlink satellites is functionally equivalent to a mothballed Brilliant Pebbles fleet. Now to be fair their response time will not be ideal due to the thrusters not being optimised for rapid orbit changes. But it’s definitely a software update away from being a poor mans Brilliant Pebbles, more than capable enough to threaten anyone staying in LEO (they probably couldn’t respond fast enough to nail down a direct ascent rocket aimed at LEO or something flying right through LEO altitude on its way to say the moon.)