"Luckily" in the US, the carrier oligopoly here won't sell you a cheap IoT plan for cell connectivity, and the "lifetime" plans sold to manufacturers are probably at least $50-100 in volume.
Maybe not on optional treadmills, but that's already here for CPAP machines that insurance pays for - they log data to an SD card in case you don't have reception, but it also has an LTE modem to upload it so the insurance company can check up on you and make sure you're using that machine, or else charge you more money for it.
