eBikes are limited to 25km/h on the motor I believe. But given how many people cycle in Amsterdam, I'd be surprised if you'd get much chance to actually get to that speed (on an eBike or legBike) very often.
But even so, the problem is not speed but momentum. A typical car+driver weighs at least 10x (actually, with modern cars it's more like 20x) a bike+rider. So at the same speed, a car will impart 10x the damage/force than a bicycle will. But cyclists are more careful as they don't have a protective metal box around them - if a cyclist collides with a pedestrian, the cyclist is almost certainly going down and getting injured, compared to a car, where the car occupant has zero consequences.
