What's to stop Russia, China or even America fielding male athletes in women's sports because they want a win?
As an example of how important a win is and the mentality behind it, Japan's Olympics Minister recently made this statement:
"She is a potential gold medalist, an athlete of whom we have great expectations. I'm really disappointed,"
Can you guess what he was 'disappointed' about? No, not that she'll be beaten by a transwoman - that she has been diagnosed with leukaemia. So he's disappointed that he won't get that gold medal for Japan.
With that attitude, it's not hard to see that people will make use of any advantage they can to get medals.