This is why the centralization of all social interaction on a few big platforms is a cause for concern. Some of the blame lies with people too; ideally, companies such as Adafruit would simply run a Discourse instance (or another forum software), and have users communicate there and receive web push notifications, and so on, instead of just using a large social platform.

As for Facebook, there are no disincentives for over-moderation. After all, it is better to over-censor and avoid attracting negative news coverage, the attention of legislators, and negative sentiments among people.