I don’t know how to best deal with such indoctrination chambers. Their members become completely divorced from reality and there’s no way to pull them back from the brink because anything you could say to that effect gets moderator-deleted. Yet vice versa, they can freely spread their propaganda and engage in “raids” on other instances.
This is essentially the same problem Reddit has (mods/admins can control what is discussed on their boards), stems from the same place (mods/admins have essentially unlimited power over their boards/instances), and has the same basic solution - let the echo chamber echo chamber and create alternative communities that don’t have that problem. And on the upside, since this is a federated space you can just have [email protected] instead of r/truewhatever7alpha.
It’s just more noticeable here because the censorious leftward fringe is both more extreme and more aggressive about it.
At least we haven’t started getting mods running bots to auto-ban anyone who has ever interacted with other specific communities yet.