For my money, the most enjoyable cheating scandal in any sport is when a professional cyclist is caught using a motor secreted into a bicycle. That is an incredibly brazen way to cheat. It is cartoon cheating-- the only thing more dastardly than competing in a cycling race with a literal motor would be to see someone attempt to qualify for the Olympic high jump wearing enormous springs before getting carted out of the stadium with an injury where they are folded up into an accordion shape.
Cyclists have decided to refer to this, the practice of entering a bicycle race with a literal motor attached to the bike, as moto-doping.