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Is that really necessary?

If your charger used to generate $X/day and all of the sudden generates $0/day most likely its broken.

It is more of installers/maintainers not interested in fixing the chargers. They would already have information about how much is being payed for each charger and from that would know some charger is broken.

I'm sure the installers/maintainers are not the blame here though. Of course they'd like to get paid for doing it. It's the owners of the equipment that don't want to pay for the maintenance. Let's place the blame at the appropriate feet here.

There's really no reason 95% of issues couldn't be caught through self diagnostics. The easiest thing for the button press is to rely on repeated presses at longer intervals, like 3 presses with at least 15 minutes between the first and last within a 2 hour window.

Or gamify it, via the charging app: if you report a broken charger, and it's verified, you get a $1 credit.