In many Alpine ski resorts there are a lot of paraglider and speedrider pilots (of which I am one, in Chamonix).
Although we're not allowed to fly directly above pistes I can imagine these drones being very popular off-piste (i.e backcountry) where we often paraglide. A collision with an untethered drone *probably* wouldn't be too dangerous assuming the rotor blades are surrounded with a shroud but if it were tethered to the skier/boarder then the likelihood of it becoming tangled is quite high and could easily cause major problems for the paraglider pilot.
Luckily Chamonix is a very traditional resort so I'd expect these drones to be banned anywhere near the piste and (hopefully) off-piste as well, however it would be almost impossible to police off-piste!