I wish that e-bike ads had the classification. The bike classes are well-defined AFAIK - it's the class legality that's regional, if any. Right now, they're actively helping riders skirt/evade the laws.
I'm pretty sure if they stopped skirting the laws, it'd eliminate a decent cohort of their customer base. Watching someone come through a pedestrian area at 45 mph on a "bicycle" that clearly is an electric motorcycle is pretty interesting.
Very slowly. Stopping is not as a big of an issue as cornering though - not only they don't have adequate traction for the speed and mass but they also don't use the front brake. Which is great as the trails which are fun to ride because of all the bends are also e-bike free other than old people riding their pedal-assist bikes at 15 mph.