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.
