How easy is jamming starlink? I don't think it is as easy as jamming gps. As I've seen numerous warning from Russia that they providing starlink to Ukraine is bad idea. That they're going to shut it down etc. But, starlink is still being used in Ukraine.
Prior to these events, the prevailing consensus in the defense community was that Low Earth Orbit (LEO) satellite constellations like Starlink were nearly impossible to jam effectively. Their defense relied on the satellites' constant rapid movement and their ability to "frequency hop" to avoid static interference. The blackout in Iran has shattered this assumption.