Online skews things a lot. Often due to how they are raised in childhood you might find more trans women online as being terminally online was more socially acceptable and the norm with their, at the time, peers. Also you tend to find a lot of trans women seeking community to be themselves before coming out whilst trans men are often able to explore their gender more in person so the idea of presenting as the ‘opposite’ gender before or at the start of socially transitioning means trans men might not be seeking that extra level of community and support - there are generally less things to learn from scratch.