It happened once. Did you do the maths here? Can you tell us which one was Kore expensive and what percentage chance there was of this hack happening?
This happens all the time. Unfortunately, in my experience, most of the risk acceptance happens without even really believing in the cost of the risk, and people just accept everything. it is highly likely someone like that accepted this.
Now that we see large scale incidents will there be an actual money value associated with upgrading systems and security for supermarket appliances.