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While I totally understand the need of remote controlling some kind of freezer units, please explain for me, why on the earth do a grocery store need online freezers? The shops are usually open and have on-place human staff 7 days a week, 10-16 hours a day.

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Centralized monitoring, so you can check if the local staff are doing their job properly, and in an ideal world, detecting performance degradation so you can schedule maintenance before they break.

Sounds legit, thanks! I am wondering then what is a good solution for this kind of issues? A physical switch on the freezer that enables/disables remote control over remote monitoring? However the operators will leave this switch on for convenience.

On site stuff likely paid minimal wage and not trusted change a freezer settings. Centralized management is cheaper (until it's not). But there are many ways to do it more secure than connecting the device to the internet and allowing incoming connections from any IP (how likely it was done).

The article is about Sweden so no they aren't on what other parts of the world would call minimum wages.

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