I understand that bikes are more concerning than cars for pedestrians due to being quiet and going the wrong way, and I hate as much as the next guy. It is bicyclists' responsibility to obey traffic laws. It seems that the police should enforce the laws against these e-bikes going the wrong way or not stopping at stop signs, not for existing in the first place.
We seem to be very against bells in the US.
Also without the constant deadening roar of internal combustion, bells are fairly audible.
The background soundtrack of my time spent in Amsterdam and Copenhagen is that have bike bells ringing.
I would be thrilled if bells were in common usage.
Bikes, on the other hand, frequently zoom down one-way streets against the flow of traffic, rarely make any audible sound (whether ringing a bell or shouting) so you can hear them coming, and treat traffic lights as suggestions.
I can't count the number of times I've almost gotten hit (as a pedestrian)by a biker when I'm crossing a street with the walk signal, because a biker decided that he could barrel down a one-way street, against the traffic, and didn't even need to bother to slow down for pedestrians walking with the walk signal.
Yes, not all bikers are like that. But there are enough of them that they pose an actual problem for NYC pedestrians.
It’s not dissimilar in London. Cycle couriers are known as psycho couriers for a reason.