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I'm not an expert by any means, but I believe that at this point there is some evidence that online communities actually do exactly the opposite.

https://journals.sagepub.com/doi/full/10.1177/01925121176921...

https://techcrunch.com/2017/09/11/study-finds-reddits-contro...

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Sometimes. As is often the case, there is evidence for both (banning/limiting, Chilling Effect, power pressure & scolding, etc), depending on the community.

In your second link, the topics were literally banned from the platform, rendering the question moot in that case.

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