The law in many US states and most European countries views the machine in this article as a moped or motorcycle. It is throttle-operated, instead of being proportional to pedal torque, and it has no speed limiter. If it was limited to 20MPH, it could be a "class 2" or "type 2" e-bike in many jurisdictions. If it was pedal-operated and limited to 28 MPH, it could be a "class 3" e-bike. But as built, it's a moped. You need a license, registration, insurance, and a helmet to operate it.