The neat thing is that Reddit is community moderated. Each community is allowed to set their own standards, but they also need to clean up their own spam. So, /r/science doesn't allow any jokes at all while /r/Antiwork bans anything that's pro-corporation.

But several times, mostly when the controversy got too hot, the admins have killed subreddits, like /r/The_Donald, /r/incels, and /r/FatPeopleHate.

Yes. Subs had moderators and they got rid of spam, but that was about it. The mods themselves were heavily pro free speech just like the founders and corporate. Back then, reddit was predominatly american and we all adopted the free speech as an ideal. Then as reddit gained a larger foreign following, they slowly chipped away at free speech. It's pretty much what happened to social media and the internet in general.

The prononents of internet censorship are canadians, brits, europeans, middle easterners, indians, chinese, etc. After all, the only place "hate speech" is protected is in the US. If you think about it, you have to protect "hate speech" if you are to have free speech. You can't have free speech without "hate speech". The idea of censoring "hate speech" is an alien concept in america. It was imported from abroad.