I don't think the parent comment misunderstand that it's an allegory, but is asking how the allegory applies. Facebook doesn't claim they want to step back from

I don't think the parent comment misunderstand that it's an allegory, but is asking how the allegory applies. Facebook doesn't claim they want to step back from moderation "because that's how the industry works and they have to stay competitive" (as in the allegory). They're claiming that the costs of extending private control over political speech to _society_ are too high. (This obviously isn't entirely altruistic: knowing how deeply stupid most people are and how commonly public opinion is outraged by failure to meet two mutually-exclusive ends simultaneously, I wouldn't want to open that can of worms either)