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I don’t know about the underlying technology, but every client I’ve used for the past couple decades supported groups.
However, they absolutely sucked. There was no way to leave. Unless someone made a new group without you and everyone used that, you’d keep getting messages.
Because Facebook is the posterchild for anticompetitive evil corporations.
They’re doing this because it will help them monopolize more content or more users. By nature, that will be harmful to the fediverse.