If Reddit does have a left-wing bias, why do you think that is?

How do you explain a (any) bias in a platform that doesn't editorialise and that anyone can contribute to?

There are plenty of right-wing subreddits. The fact that they're unpopular and filled with nut-jobs maybe says that being 'left-wing' isn't, in fact, a bias but just what human decency looks like when you take away establishment propaganda.

Just a thought.