Most have a cf slot to store the sleep data, it’s how the doctor / clinician can see if it’s working, make adjustments to pressure etc. but for convenience they can just upload the data directly.

They also do OTA updates.

However they also can perform an enforcement function: compliance. Insurers will penalize users of the device for not using it enough.

This isn’t something I know much about just have seen it discussed, I don’t think all jurisdictions allow insurers to access this data for enforcement but it does seem to happen in USA.

I think what happens is the insurers agree to pay for the device in installments. But they will cancel those payments if the person isn’t using it.

But disabling the modem won’t fix that problem, you’d still get caught by the cf recorded data, or failing to provide it.