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They're under a crane lifting stuff up overhead on a work site, that's probably why.

but it's not a construction site though

Falling bolts and tools don’t really care if they’re on a construction site or not

So let me quote my original question

>Does this imply that everyone living under the kites will have to wear one too?

Maybe just the ones living under the crane while it's lifting stuff over them.

That also assumes people are living under the kites.

I think you're overthinking a short demo video and hats. I doubt anyone fought hard against wearing it, and company liability is different from your own personal risk assessment.

I doubt people will be living under the kites. I doubt there can be anything in the vicinity of the kite flying range for that matter, so no windmills or high tension lines or buildings or anything, which limits this thing's options especially in higher density countries like NL.

no, it's because the are directly at the site where the kite is launched (and on national tv)