I have seen many fake leaderboard first places made by car . Some of them are hard to be noticed but if 150 km/h top speed is seen on flat surfaces cycling ,I mean...impossible .
Can you have in mind at least creating a parallel if not unique leaderboard for users that have powermeter or cadence sensors and somehow combine that creating an algorithm ? I know that not everybody has pwm and cad but subscribers do not like loosing places on a platform dedicated to leaderboard to somebody cheating .
A wind-speed algorithm can also help . I can call a kom with high speed wind from behind also a cheat .