Even then, there will be cheating 
maybe even more. Just look around all Sports (IRL or Virtual) where money is involved. People dope to win Gran Fondos! 
You mean, like, a bike race?
A very obvious first step to addressing weight doping would be to ensure that weight is sync’ed between apps.
For example, I weigh myself daily, and my weight diary and Apple Health both always show a weight accurate to that morning’s weigh in.
I just checked out of curiosity, and TR, Strava, and Zwift all showed inaccurate weights (only off by a couple of kilos, but that’s just because my weight hasn’t fluctuated much recently).
If one manually sets their weight in, say, early November, a good pile of holiday kilos could honestly (or not honestly) be forgotten about by the race in January.
Ride data is already being shared between these platforms. Weight should be too.
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