Let me know if I'm off the mark about any of this, but my guess is that we'd see a significant bump in cis women if the polling were anonymous. Things are getting lot better now as the internet becomes increasingly diverse, but early on it was dominated by white, cishet techbros who suddenly found themselves with their own anonymous soapbox with endless reach.
Cis women learn from an early age that outing their gender on the internet results in creeps crawling out of the woodwork to harass them, so they don't do it. Transwomen face the same misogyny, but are far more comfortable on the internet owing to their experience of using it before hatching.
Sorry, I'm really stoned and was just spitballing there. Is what I said reactionary or adjacent to the way reactionaries use the term male socialization?