Only if you are operating in an unsafe manner enabled by the 'additional features' lets call them, of your vehicle. This is the concept of 'materiality'. As I understand it - and I could easily be wrong - in the EU if you are riding an 'illegal' vehicle then you are automatically at fault and liable in the case of some sort of mishap. Materiality is irrelevant. Thats there, not here in the USA.
Here in the USA the illegality has to be 'material' to the mishap. So if you are going 5 mph, you have a 6kw Lightning Rods motor on your ebike and you get hit by a truck while in the bike lane, its not going to affect the outcome of the accident report. Your speed was within the law and the motor was not in any way material to the accident. Or... you are going 5 mph on the same bike and a drunk falls out of a bush and you run him over. Whatever comes of that... the motor will not play into the police report so long as your story is believed and the forensic evidence backs up your side of the story.
I have a personal example that is very similar. In late 2017 I was going 15 mph in a designated bike lane when an inattentive motorist T-boned me. The bike was a Specialized Stump FSR with a 3kw Cyclone mated to a 52v battery. Nobody cared. Not the cops. Not the driver's insurance company (who paid for the bike with its improvements - and they had receipts for the motor stating its nature in itemized technical detail) and not the police, who found the motorist was the proximate cause of the accident. The police knew what kind of bike it was (the officer who took my statement discussed it with me) and in fact the police very kindly took my bike from the scene of the accident to my home and put it in my side yard as I left the scene in an ambulance. This is a major metropolitan area with over a half-million residents and not, like... Mayberry or Springfield.
So when all this Fear and Doubt is sowed on the internet... its just the internet. I shake my head and move on.
Oh and also
the 3-class system is now active in 36 states. Every year it spreads further. With bike sales being what they are, this is only going to go one way in the US. No legislature anywhere is going to rain on the ebike parade ... with one shining exception: The People's Republic of Newyorkistan.