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You can find a happy middle ground between unrestricted free speech (of real people) and banning spammers and people who run alt accounts.

Making the system invite-only may be a requirement.

Evidence and experience say this isn't true. No platform has ever hit this balance.

I would argue the simplest answer is transparent moderation.

If needed, split a team of moderators by political association and have each moderator handle the users of the "opposite" side.

Otherwise you end up getting shadow banned for reporting an actual call to violence which then took place.