I frequent hackernews and /r/askhistorians because of strong moderation. I support free speech. Communities being moderated are different than platforms being exclusive to certain communities. (I consider hackernews to be a community not a platform due to its strict focus.)

I can choose which communities to ignore, lurk in and participate with. I dont support extinguishing communities I choose to ignore.

You get what you get when you choose to congregate at the firehose nozzles of twitter and /r/all