Facebook and Google provide more of a benefit to individual news organizations than vice versa. If everyone uses FB / Google already, you’re not doing them a favor by posting your content to those platforms, they’re doing you a favor by allowing more eyes to see the content. Of course in aggregate if all news publishers stopped publishing content then maybe less people would use FB / Google, which could harm them.

Ben Thompson explains more about this in an article here: https://stratechery.com/2020/media-regulators-and-big-tech-i...