Have you tried asking them to stop?
However, I highly doubt it’s actually legal to fly on private property and it sure as hell isn’t legal to film inside of people’s homes which is a violation of domestic privacy. Also, in Finland the property owner also owns the airspace above up to 150 meters and drone are only allowed to go up to 120 meters so there is no circumstance in which you’re allowed to fly on private property without permission.

What a shitty excuse. It’s probably kids who fly those things and their parents don’t even know because nobody has the spine to go tell them. Then you come here plotting your petty revenge for a situation that could be easily handled by talking.
Unspoken expectations are premeditated resentments.