This was my thought too, or more generally: why would they do this? What are the benefits to them? I doubt stealth as you'd have to expect someone would notice at some point. Does it complicate jamming? Or simply an otherwise unused band so plenty of available bandwidth? Are the usual channels getting too crowded?
My first thought would be clandestine comms. A terminal operating outside the standard frequencies wouldn't necessarily be picked up by systems looking for Starlink traffic.
But the majority of communications would still be in standard Starlink frequencies using standard protocols. The terminals and satellites being repurposed Starlink gear are going to operate more or less the same as Starlink - most of the time. Having some terminals that operate in random bands and mostly transmit straight up would make them harder to track than the standard off the shelf Starlink gear.
