Phased arrays are good at rejecting incidental interference, which is why they were used to address radar jamming. Of course that also meant that billions were

Phased arrays are good at rejecting incidental interference, which is why they were used to address radar jamming. Of course that also meant that billions were poured into developing technology to counter that resilient property. Anyone capable of blocking GPS on a non-trivial scale would be easily capable of blocking Starlink as well.