TwoXChromosomes is a movement sub - similar to the_donald and other political subs. It caters only to a small portion of the userbase (people who want abortions) and is rather political in nature.

Many users of the sub are anti-abortion, and most of them are feminists. They should be treated as any other movement sub, such as those dedicated to gays and lesbians, alt-left, alt-right, and incels.

TwoXChromosomes is not a neutral sub, unlike r/pics r/jokes, r/funny, r/mildlyinteresting, r/news, r/aww, and all other default subs. It leans one way (towards feminist ideologies), and thus does not make a good sub.

On top of that, TwoXChromosomes is a sub dedicated to females and females only. As there are a lot of male redditors, TwoXChromosomes, by its nature, will not serve a supermajority of its users.

Default subs should serve a supermajority of Reddit's users. For example, r/britain is not a default sub because it only serves British redditors. r/football is not a default sub because it only serves football fans. r/the_donald is not a default sub because it only serves Donald Trump supporters. Therefore, r/TwoXChromosomes should not be a default sub, because, by its very nature, it is a sub for people with two x chromosomes and only people with two x chromosomes.

Therefore, its status as a default sub should be removed, since it is not a neutral sub and has political leanings, as well as only serving a medium portion of Reddit users (in other words, it is a niche sub).