It’s true that there are different classes of ebikes. Class 3 ebikes with enough power can be basically motorcycles disguised as bikes. Mine is a class 1 and very much a bicycle. If the distinction can be made that some ebikes do not require pedaling and are therefore motorcycles, by extension it is equally valid to say that ALL ebikes must have pedals so all ebikes are bikes. The truth is really somewhere in-between. Not sure how important that is to a shower thought though.