You can replace the OS that it runs with one of your own (that's not signed by Starlink keys).

You could, for example, modify the root filesystem to allow you to ssh into it, or query it with SNMP, or perhaps report a different GPS location to its APIs (instead of the one it's actually at).

I'd personally like my Starlink to use its real GPS for calculating which satellites it needs to talk to, but only report a truncated (or no) location to HQ, so that SpaceX doesn't have my meter-resolution location every time I'm online.

I imagine there are some Ukranian soldiers who feel the same way.