It doesn't surprise me one bit. Not a tad, nor an iota.
I've seen 'minor' stuff happen, but not with any independent witnesses who could back me up if reported, so on a hiding to nothing.
Plus I've seen the reaction if stuff is reported (not drugs but cheating in other ways) and the reaction tends to be one of 'shoot the messenger'
It's one of the reasons the offspring became jaded with the sport; the tolerance for various forms of being elastic with rules at all levels