Well… You’re kind of wrong. In the French law, it is clearly stated that a bike is a two-or-more-wheel vehicle propelled by human power. Section 311-1, 6.10:
Bike: vehicle with 2 or more wheels and exclusively propelled by human power of people on this vehicle, in particular with pedals or cranks.
So, unicycles fall into the “non-motorised personal mobilitydevices” - such as scooters and skateboards. Then, unicyclists have to ride on the sidewalk at the pace of a pedestrian. Do we respect that? Well… Usually no. As we can go at the speed of a bike - especially those of us who have a geared hub -, it seems stupid to stay on the sidewalk.