Because Electric Unicycles are still so new, the legal framework hasn’t caught up in most countries. As a consequence they are often in a grey and yet to be defined area.
In some countries they are accepted as a personal transport vehicle similar to an E-Bike, in other countries they are seen as Mechanically Propelled Vehicle and therefore are closer to Mopeds/small Motorbikes.
If you are not sure, only use them on private ground. If you are allowed to use them on public streets or on footpaths or in bicycle lanes make sure that you respect the other users of the public area.
Because of their small footprint, moderate speed and low energy usage, we think that they should be treated like bicycles, or maybe E-Bikes.