[rbanffy]

The best I could find was Samsung TVs connecting to a nearby unsecured hotspot (some routers used to have that by default).

OTOH, if during setup you agree to them sending telemetry, they might just use a cheap cellular modem with arrangements with local telcos for low-traffic data connections with a lower QoS than telephony, the same way some cars do OTA updates even though you don't give their on-board computers access to your phone or home.