You missed my point. It's impossible to meaningfully control the export of physical terminals. But as I pointed out above, SpaceX has already been doing some geo-locking.
And while geofencing + allow-listing for sure provide value in e.g the Ukrainian conflict, it's a weak protection compared to goods that are actually under strict export control (e.g ITAR), and will always have to be done after the fact. Russia could for example put Starlink on drones launched from the Baltic Ocean targeting Poland or whatever.