They realized they were wrong and there’s a growing antitrust movement in the US.

Is there precedent for such a thing? Five or ten years after approving acquisitions and then saying 'oh our bad, that was anticompetitive' I'm not a fan of FB, was only a user briefly (though still maintain whatsapp) but find that this action is a misquided attempt to punish FB because some people can't accept its success and find the platform abhorrent.