“A few of the usernames give away the gender of the people behind them.”
While I agree with everything else you wrote and I appreciate your pointing it out since I think it’s good to have that reminder every now and then, I want to point out that you can’t always tell from the usernames even when you think you can.
For example: RebYidd is a girl/woman, I am a girl, Jonny Appleseed is a girl, rebshidduch is a girl, and Little Froggie is a man.