The problem with e-bikes and mopeds is that their "top speed" is determined by...the rider's weight.
My spouse's old moped was rated for a certain speed - based on bearing a rider weighing nearly twice as much as she did. It could go twice as fast with her on it.
I think modern ones can almost reach freeway speeds - with an unlicensed rider operating it.
Bay Area teens are facing more e-bike injuries
https://www.sfchronicle.com/bayarea/article/e-bike-crash-injury-21331489.php