Toppledge
Heptachampion

I know he lost his titles, but it happened 8 years later, after he cashed all the fame.

Sure, now he is scum now, but he is retired anyway. He won't be riding again, doping or no doping. If anything, he will profit from his extra 15 minutes of fame.

The morality of cheating is open to debate, but winners may do anything to win. Drugs included.