Last week a judge threw out the US Women's Soccer Salary Discrimination part of their lawsuit against US Soccer. As I pondered last year, the judge seemed to view the way the US Men's and US Women's salaries are paid under a collective bargaining agreement as being different. Thus, the judge seems to have ruled that US Soccer is not paying the US Men and US Women differently because they are discriminating against female soccer players, but rather the salaries between the two groups are different because the two groups have chosen different ways to be paid.
Since the ways they are paid are different, then it's not salary discrimination. I am not convinced that is always true, but it would be substantially more difficult to show that salary discrimination occurs; unfortunately for the US Women's Soccer players.