You can join most subreddits just by knowing the name. You can't join most Discord servers without an invite; they aren't public.

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firesteelrain 21 hours ago | parent | next [-]

Subreddits are influenced by the Reddit algorithm where popular, leftist things end up on the front page and you may be influenced by them even if you never asked to see that stuff. Only way to not see is make a conscious effort to stay on Home. Even that doesn’t make you immune because Reddit will suggest subreddits that you may not necessarily want to see content.

Discord is different because you have to intentionally join a leftist or conservative chat channel and the content is not suggestive.

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craftkiller a day ago | parent | prev [-]

private subreddits and public discord "servers" both exist.

	▲	everforward 7 hours ago \| parent \| next [-]
		It’s more about the user intent that causes difference. I’ve never been in a private subreddit, and the only public Discords I’ve been in are corporately managed with “community managers” and stuff.
	▲	ChocolateGod a day ago \| parent \| prev [-]
		Reddit is more of a public forum though, Discord is not. On Reddit, the upvote and suggestion system amplifies the echo chamber, people are having an entire conversation on one topic. In Discord people usually don't read more than a few existing messages unless they're specifically looking for something, it's far more unorganised and transient.