The question wasn’t why these systems are setup insecurely (which has an obvious answer about cost prioritization).

Of course there are ways to setup these things securely, same with smart tvs and doorbell cameras and whatever else is getting hacked. People just have a bad time figuring out the cost benefit of all of this. And frankly we don’t know if that cost benefit has even been crossed yet, perhaps this doesn’t rate.

You yourself are engaging in cost prioritizing without adequate information. Sending a technician on site may be extremely expensive (opportunity costs and inventory risk on cold chains are wild).