It's pretty cooked that a p-plater can get a car that will do 200 easily, almost twice the legal speed limit, for a few grand. The implications of that with dickhead factor is always gonna cause a lot more damage than someone on a 40km/h scooter. Which is 15km/h over the legal limit of these vehicles, and I believe the default speed limit for all cyclists in most places in Australia, law is usually what the signs say, or if not signposted (eg. bike path), it's the lowest road speed limit being 40km/h. I'm not sure a bicycle speed limit has ever been tested in a legal setting, but that's how it was explained by someone with legal expertise.
Really, if we have an interest in safety, reducing injury and death, it's ridiculous to allow cars that can go so fast, and have scooters and e-bikes limited to 25km/h.