As a proponent of the decentralized web, I've been thinking a lot about the aftermath of the domestic terrorism that was committed in Pittsburgh at the Tree of Life synagogue over the weekend, and how it specifically relates to the right-wing social network Gab.
In America, we're unfortunately used to mass shootings from right-wing extremists, who have committed more domestic acts of terror than any other group. We're also overfamiliar with ethnonationalists and racist isolationists, who feel particularly emboldened by the current President. Lest we forget, when fascists marched in the streets yelling "the Jews will …
It's hard to imagine a centralized way of banning websites online.
Seems like the fediverse/Mastodon world is moving towards shared instance block lists, i.e. pick some people you trust and import their block list. For now it doesn't seem to be a proper automated feature, just random github repos like the (awesomely named) BLOCKchain.