@GossiTheDog according to some of the reporting I read ( https://news.err.ee/1610183296/hackers-raised-freezer-temperature-at-selver-supermarket-to-50-c) this seems to be opportunistic attack targetting systems for which replacement has been ordered but left exposed/operating until it arrives (perhaps in hopes that noone will find them?).

At least in some cases (e.g. here in Estonia) people have been at least keeping an eye on the vulnerable machines and caught the tampering just minutes after, so there were no actual loss of produce.