In CA during the 70's (AIR) mopeds were selling like the proverbial hotcakes until some group put together laws that regulated them; this resulted in the same death noted above. The industry never recovered. IMO if the government sees a way to derive money from e-bikes, they will. The numbers here are too small to be of interest now. Also, it's illegal to ride e-MTB's in almost all off road areas, but only one that I know of has any enforcement.