And who can blame them? There are enough injuries and fatalities on the ski slopes as it is, without some dummy distracting both themselves and others in this way.
They might like to think it's silly plastic blades but the reality is, every single one of those items contains batteries of types that have a history of self igniting.
Not quite, they have very limited rights up to 500' and only insofar as any intrusion causes "interference with this air space would affect the landowner’s reasonable enjoyment of the land". Pretty hard to prove in the case of the NT...above 500' they have no more rights than any other member of...
They don't own the airspace so they cannot prevent you overflying, period. And while they can politely ask you to leave the site if they find your drone taking off from "their" property, they have no recourse in law to do anything else. They could sue in theory but for what? No loss or damage...
Issues?
But here's the thing. The government doesn't give money away as you know. Well except to defence contractors. Someone is paying for this huge inconvenience and it's not your Uncle Sam.