No. Its unenforceable anyway.
How would I know someone is a female any more than I know someone is a “pashuta yid” a “ben torah” or even “well informed” (ok some of this users statements contradict the claim to be informed but I digress).
You can’t have your cake and eat it to. If you want to join an anonymous forum then you have to understand that you can’t assume anything, take everything with a huge grain of salt and even then, be very skeptical of everything you read. There are risks to anonymous forums and this is one of them.