Governments are throwing the book at hoverboards...
U.S. government declares hoverboards unsafe
Apparently they need certification to be legitimate, and none have been certified yet.
In Holland hoverboards are classified as mopeds, which means they must have a type certification, license plate, a seat and handlebars, etc.
As current hoverboards don't have those they are illegal on the street. But they can also not be used on the sidewalk (as they are mopeds) so they can only be used in areas closed to the public...
The Segway is officially a moped too: it has no seat, but was classified and certified as a 'special' moped. The chance that hoverboards can go that route is slim though.
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