https://status.inreach.garmin.com/ has some status updates and says that SOS communication isn't affected.
"inReach SOS and messaging continue to work."
"inReach SOS and messaging have been fully functional and remain so."
This is reassuring because people who go to remote places and rely on the inReach satellite SOS and messaging have not been affected. If they had been affected, they would've been cut off with no explanation--for example unable to relay status to family, or to request an early pickup. While not in itself life-threatening, it would cause a lot of unnecessary worry and possibly unnecessary rescues.
I had wondered if their satellite messages was affected. Obviously, a message goes from the unit in the field to a ground-station, and then to the recipient's regular messaging or email. The question is whether it touched one of Garmin's servers to do that, and if that server was affected--apparently not.
The rest of their services clearly had as little spent on them as possible to "maximise shareholder return".
In fact the billing is completely separate.
You can send SOS and tracking points, and send/receive messages. But you can't get new courses and/or maps onto the device.