These contraptions are illegal to use in public and if they become popular the laws against them will be enforced immediately, because they're incredibly dangerous. It is impossible to provide effective braking on a skateboard. The rider has absolutely no means of impeding their forward movement, so even if the board has effective brakes it's just going to throw them off. This is a minor problem if you're rolling aro…
Citation needed.
> It is impossible to provide effective braking on a skateboard.
I don't skateboard, so I don't know, but it seems like a lot of people are pretty effective at transporting themselves via skateboard. Besides, how does this contraption exacerbate the problem? If it's accelerating you to higher top speeds than a self-powered skateboard, then sure, but if the speeds are the same I don't see how this board could do anything other than improve braking.