Otherwise, this sort of spoilage could easily happen by accident as well.
These are minimum wage workers - they don't have bean bags in the nap room, employee massages and stock options.
Groceries see HVAC in the same way. If they can get their issue addressed or diagnosed by their HVAC contractor without him having to schedule and physically travel to their site, they'd prefer him to solve/start solving the problem immediately. Time is money and the faster the tech can diagnose the problem, the faster he can get on fixing it.
And yes, the prevalence of these systems means that many HVAC techs have the ability to turn off their customers' air conditioners/fridges. They don't use it maliciously, because that would be actual suicide for their business.
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Source: A close friend of mine runs an HVAC business (~8 employees) doing residential and commercial installs, repairs, and maintenance.
I think the cost/benefit equation is gonna collapse in the era of AIs exploting vulnerabilities at scale, but it's not like there's zero theoretical benefit of this capability on its own.
Take away the security aspect and centralized management is just so much easier and reliable. Humans suck at doing things they were supposed to.