What about the fact it is simply outside the aircraft limitations and therefore totally illegal?
yes - it could be flown positive G throughout and the helicopter doesn’t know which way up it is.
yes - some rules we would like to break because we have our own logic behind how we can mitigate the risks to an acceptable level.
Yes - if suitably trained this manoeuvre MAY not stress the airframe unnecessarily.
.... etc etc etc the arguments in people’s posts are good, in a world without rules.
However like them or not, we do have rules, and we can’t all go writing our own, however much we’d like to. A blatant public disregard for the operating limitations of the aircraft through showboating outside the governed military/display environment, says a lot about a persons attitude towards being above the regulations. For many people i’ve flown with in the past this is exactly what makes them a danger to themselves, and others who look up to them, or fly the aircraft after them....