Facebook doesn't have the ability to watch every livestream on its service, but they absolutely do shut them down when people report them, and, moreover, proact

Facebook doesn't have the ability to watch every livestream on its service, but they absolutely do shut them down when people report them, and, moreover, proactively reach out to law enforcement when violent activities are being livestreamed or posted to its service. And that's the difference from Parler: Parler revels in attracting those types of posts, and per Amazon's court filings, Parler does nothing to remove violent posts on the service.