Captain Kirk said:Cheating = the breaking of rules.
The rules of this game/sport are being broken by people playing the game.
Everyone has the choice to break rules, whatever the environment. They do so at their peril.
In this case they loose privilege of being invited to participate in this game.
That is their choice, they can take their bat and ball (or bike) home and play in their own backyard with their backyard rules.
Which rules? The official rules... yes. The rules actually generally followed by almost all the riders... not so sure those are being broken by those who dope.
Who follows allof the "official rules"? Nobody. So by that definition everyone is a cheat, and that's not a very useful definition. I think we have to go with the rules that are actually followed by most of the riders - and, like it or not, that includes "anything goes in terms of doping as long as you test clean".
For example, is it cheating to collect the money in the middle of the Monopoly board when you land on Free Parking? Yes, it is cheating, if you're playing by the official rules (which state all taxes, fines, etc. get paid to the bank, not put in the middle of the board, and there is nothing about "free parking" in the rules which says landing there means pick up money in the middle of the board). Of course, most players implicitly agree to modify the rules with respect to Free Parking. I don't know, maybe they even do it in official Monopoly tournaments (do they still have those?).
Whether doping is "cheating" is not that clear.