Fair questions!
As far as I can tell the other comms have a loose moderation policy and this one is intended to be very strict, along the lines of the womensstuff@piefed.blahaj.zone comm without input from non transfemmes.
This comm functions as well as part of a local (to me) community along with some other comms I recently started but I see no reason not to open them to federation beyond our local geographic borders at all. Posts in here are mirrored to a petgirl bbs server and comments/replies there get federated back here through regular piefed accounts, a bridge if you will.
I’m happy to let anyone in good faith post or comment if they identify as transfemme, this is the first I have heard MTF called out as trans med but I see your point maybe that’s why I didn’t make a /mtf. ‘amab’ doesn’t really encapsulate the challenges of trying to present and be feminine (whatever that means to a woman) for me so here we are.
Gatekeeping is intentional (as you noted there are other comms for allies), transfemme is subjective, transmascs are free to make their own comm.
I hope that clears it up, I’ll try to distill this down for the sidebar thank you for the questions! Pinning it in the meantime