It reduces the barrier of entry for new users to get an account going that is not flooded by political extremist views in it’s feed.
It causes anonymous users to not see they shitshow. And since most users start out by browsing anonymously while deciding whether they want an account or not, that is a big deal.
It gives the impression that this community is at least somewhat ok with the views that these extremists hold.
It should be opt-in to view posts and comments from these sources.