Its mostly head injuries. These are between just a rider and the road, and the small number of fatalities were from geriatric riders that should have been in a wheel chair. The solution is to just wear a helmet.. And since its not harming anyone aside from the rider themself, that should be a personal choice. No need to increase the barrier to entry with license, registration, and insurance. Its like people are just trying to find ways to make money off the increase in popularity of e bikes.