The root of the problem is that parents spend good money on pitching lessons for their daughters and the pitching coaches either don't correct poor/illegal mechanics or specifically teach them to cheat.
Throwing illegal pitches is cheating. It is improper. And it is initially and ultimately the responsibility of the player's coach to ensure that the pitcher is throwing legal. It is improper, unsportsmanlike and immoral to knowingly put a pitcher out there who is going to pitch illegally.
And you knowingly allow it by not calling it because TD or UIC says so and they sign your checks? That makes you part of the problem and just as complicit as the coach, more so really because your job Iis to enforce the rules. Which is immoral? The guy that puts a struggling pitcher on the mound or the guy that that gets paid not to call an IP? What is the incentive for a pitching coach to teach legally if no one calls it? Can it not be assumed to be legal if no one calls it?