It’s an enforcement problem.
The riders know they’re riding where police cars can’t get them. They also know that the bike cops aren’t allowed to ride ultra powerful electric motorcycles. They also know they can just drive off across some grass into a park if anyone tries to stop them.
It’s a hard problem.
> I suspect that as time passes, we'll find ways of allowing ebikes to flourish.
Electric bikes are flourishing here. Electric motorcycles on bike paths are the problem.
I think the electric term is confusing the issue. If it helps, imagine that these were just really quiet but powerful gas powered dirt bikes riding on the pedestrian path. That should give you an idea of what’s going on.