Like mentioned in the video Moppets are annoyingly loud. They are allowed on many of the bicycle paths (and go on the once they're not supposed to anyway). So if a city center diverges car traffic but has a bicycle path through it they ruin the otherwise calm. In my personal opinion they are not suited for bicycle paths at all. And don't get me started on 'brommobielen' (tiny cars that can go max. 45 km/h and you can drive with just a scooter license). Those things annoy the heck out of me. They either drive you off the bicycle path because they are just cars and should be on the road, or, they clog up the roads because they are not cars and shouldn't be on the road. Dutch infrastructure is just not made for them.