this drug would be worth a lot of money, but we'll keep secret except just for the one top performer, because wide distribution would increase the risk of a leak substantially.
and remember: the top performers getting busted would probably mean the end of pro cycling as we know it for decades. cycling isn't a huge money maker for financial investors like football, rather it's a money pit for sponsors. do sponsors love a podium placement more than being forever associated with dirty cheaters? they'd risk it all for modest gains. a young superstar would trade a life of a good salaried position with some more money but also a high risk of being banned from the sport forever, thus no source of income at all and also the questionable title of being the killer of a whole sport.
so imo: it's possible, but unlikely.