E bike is quite a broad term. It can mean a pedal assist bike upto 250w, which cuts out at 25kph. Or it can mean something more powerful, that can do 50+, without a need to pedal.
Over here we have two types of dinosaur powered bikes, those limited to 50kph, where you have a blue number plate, no helmet, and are allowed in the cycle lanes, and anything capable of more speed, where you need a license and a helmet. There are moves in Amsterdam to ban the former from the bike lanes, which is a welcome move, they are a noisy menace. Especially as many of them have been derestricted, the local plod do frequent cracking downs on such machines. I wish brommer riders would stop trying to play chicken with me, they always lose... but I digress.
E bikes that are capable of speeds more than 25kph, or do not require the pedals to be turning, sure, treating them like their dinosaur burning equivalents, but I very much doubt that trying to enforce insurance requirements on pedal assist bikes will ever work. Apart from anything else, the benefits of pedal assist bikes to the health of the nation far out way any advantages of the insurance would give.
Pedal assist e bikes allow an older generation that had had to stop cycling due to age, to continue to do so, this is good for their health. It should be encouraged.
And I say this as the person who was over taken recently on the Cauberg by oma and opa on pedal assist bikes.
J