because half of the people on this forum cannot deal with the fact that a woman might be a) interested in Bitcoin, b) articulate (after all they have never actually spoken to a woman) and c) smarter than they are.
I just use the default 'he' when I don't know anything about their gender, I don't really care either way. I'm pretty sure Tera is male though, there are certain typical differences between men and women and the way they write and explain their thoughts and Tera shows typical male characteristics. It has nothing to do with intelligence, I know several women who are interested in Bitcoin and are also very intelligent and articulate.