Might be shared infrastructure

Unifi has Starlink integrations in the beta software. Don't know if it's been made final

See the power outage in Iberia as a counterpoint.

Also when there's a fiber cut, it usually takes out everyone since there are frequently shared conduits or poles.

Everyone reverting to mobile usually takes everyone out.

If the hotspot is sourced from the phone, the phone tells the carrier

The usage is in Ukraine