Reddit is very clearly not in favour of free speech: https://www.marketwatch.com/story/reddit-bans-thedonald-and-... . Aaron Swartz was very clearly in favour of free speech: http://www.aaronsw.com/weblog/becausewecan . I think the reasons for this are self-evident.
I don’t want to disagree with you but note that those articles are 15 years apart. I think public opinion inside and outside of tech on “free speech” has changed quite a bit over that time. For example I feel like there used to be more of a libertarian bent in tech then as opposed to now. Is this perhaps an unfair comparison to make considering the general change in opinion over that time?
https://www.youtube.com/watch?v=4-oV42OMQoE
Freedom of speech is not a small issue. It lies at the core of our civilization, and is unambiguously one of the few things that made "the West" prosper. Aaron makes a very cogent and clear argument for free speech, and its enduring importance.
To arbitrate rights based on public opinion is idiotic and dangerous. This is why we have a constitution.
Of course, Reddit has the right to do this, as a private company, but that's not an argument for doing it.