Wrong way and red light jumping puts them at risk.
A 30-40 ebike hitting somebody or screaming down the cycle path or a road cycle lane, put them, drivers, other cyclists at risk.
One yesterday almost took out a lady opening her door, she looked properly (I was in a queue of cars next to her) but oddly you don't expect the speed of that thing coming along.
30-40 down mixed cycle lanes is just plain dangerous.
Not as dangerous as a small car or SUV, but people expect them, and the 'unregistered' now-a-motorbike can still create a lot of harm.
I've nothing against legal version being used, and used where allowed*, but on bridleways, cycle infrastructure and through pedestrian cycle/walking areas (aka JustEat territory) they're fecking reckless.
*and encouraged over car/suv use.