In the Netherlands there used to be electric bikes that go up to about 25 km/h, mostly for the elderly, but in the last few years there are also "speed-pedelecs" that go up to 45 km/h and are popular with commuters.

Count as mopeds, and controversial because they are more dangerous (partly because they look like normal bicycles and the rider is sitting upright but they're going much faster than normal bikes, other traffic doesn't expect it).

But they do make it feasible to use a bike for longer commutes.

In the Netherlands non-assisted electric bikes are not allowed, which is why you don't see them (except the occasional violation). In other countries you have bikes with throttle, essentially an electric scooter.