I don’t think it is limited to this sport. It is the human condition. Most of us want to appear better than we really are.
The strava straight lining at local trails is a classic example. Ordinary mountain bikers, with no championship on the line, are more than happy to create a shortcut in their local trail, just so they can be momentarily at the top of a cyber-leaderboard. As soon as one knobhead does it, all the other leaderboard wankers do it too, because they are all desperately competing with each other. It is pathetic. And that would become the actual trail, until a regular mountain biker gets the original corner back by filling in the straight line with branches.
If the ordinary punter is prepared to cheat for zero actual gain, the temptation must be insane at the top level.