If a war breaks out, the first thing an agressor would do is cut all land based communication cables. Star link could become uber valuable in that case.
Fair thought...though in practice, not as much as you'd think. There's a few pieces to the puzzle.
1. In some countries (especially third world), local grounstations will be required by the authorities, and all traffic within that country
must go through the local ground stations. So...taking out ground stations basically takes out starlink.
Obviously starlink has (or at least, once the ISL network is fully armed and operational,
will have) the technical capability of operating within that country even without local ground stations, but, regardless of #1:
2. Fundamentally, Starlink needs permission to operate in a foreign country. In the event of a war, that permission could be revoked, properly or not, by the 'ruling entity' (a purposely abstracted title). Because Starlink is effectively
America, if Starlink were to continue operating in defiance of the 'ruling entity' that explicitly means America has self-identified as an enemy of that 'ruling entity'.
While maybe no biggie if its the Taliban or whatever, it is not SpaceX's place to make decisions on who the US identifies as state enemies.
3. In the event ground stations from neighboring countries can provide co-visibility to users within the war torn state (instead of using ISLs), that still results in the 'enemy of our state' scenario. Again probably no big deal if its like Israel vs Palestine since they already hate each other, but it could lead to some uncomfortable situations for some country pairs.
4. Not really part of the discussion but worth noting anyway, In the event the US is involved in the conflict, our warfighters will use existing (and future) satellites/constellations for their communications, where the military controls the end to end infrastructure. NFW will secure/important/tactical military comms (like what would be necessary in a theater) ever go through commercial infrastructure (like starlink) along side your steaming reruns of Mad Men. Low level stuff? Sure. That private wanting to video chat with their toddler from some 'Stan? Fire up the starlink terminal and let everyone have more time.