It's becoming a plague of modern life with all road-users, even pedestrians are at it.
The number of cyclists cycling with no hands on the handlbars while scrolling through their phones is increasing dramatically. It would be an impressive feat if it wasn't so potentially dangerous. Darwin Award winner potential.
A lot of cyclists have impeccable manners on the road, as do a lot of motorists. It's the dickheads that make it dangerous for themselves and others.
Making bicycles/cyclists uniquely identifiable, as is the case with cars, would force them to cop the f**k on when cycling or else run the risk of getting prosecuted.