The double standard of topless & male-presenting being ok but topless & female-presenting not being okay is confusing and pointless. The rule won't force anyone to go topless if they'd prefer not to. It just levels the playing field for everyone.
I've seen men with much bigger boobs than women proudly display them at every beach, lake and festival I've ever been to. Why is that ok but not ok for women? Nobody can give me a good answer that's not tied into some patriarchal, thought-terminating religious BS. Everyone should have the option to go topless, irrespective of chosen gender.