Then I would say it doesn’t matter because they’re not riding like a bell-end. The system will have done it’s job.

It’s more about liability, if someone is riding around on an unregistered ebike and cause some sort of incident then they (or they’re parents, since IMO it’s a lot of kids who are ripping around on these) are the liable party

Does it matter if the coo knows or not? If they do something stupid and get stopped, the cop will realize and fine them for not being registered.

You can also drive around in a car without a license and a cop would never know unless you drove stupidly and they pulled you over.