I don't think that the authorities have allowed it to happen.
I think that they have ensured that it happens. They have made rule changes to support their decision.
The authorities are male-dominated organisations who have dealt with the transgender issue by ensuring that elite male sport is entirely untouched. Their way of dealing with the transgender issue is to ensure that only women and girls are systemically disadvantaged, so they deliberately created additional opportunities for sub-elite males in the women's category. Win/win as they see it. Positive outcomes for more males are guaranteed, which is the way it should be of course in their eyes.
They haven't even considered the impacts on women and girls.
Because they're only women and girls, not real people like men and boys.
And it is right and proper that women should always give up their seats at the table for men. Modern-day gender chivalry. Women always have to make way for men. No debate. If you even ask a question then you are a bigot.