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Isn't one of them going around offering people "reverse gangbangs" to resign from Anthropic?

No, he is saying that if they stop preaching it, they stop being invited. A -> B does not imply B -> A.

So even those who were never invited are afraid that they won't get invited anymore?

No, just the ones that are part of this specific community described in the blog post.

"Mostly" in the title implies otherwise.

The title is senstaionalist. The actual content of the article refers to a specific community, including Eliezer Yudkowsky, Aella, and others.