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The core thesis is that everything we do is ultimately selfish or genetically selfish, or a currently maladaptive execution of a selfish adaptation - you get the idea, even though it's not in our interest to be consciously aware of it. That's the elephant in the room/brain, something that's really obvious but rarely discussed.
That means a huge chunk of human behavior is signaling, including a lot of less obvious things. Like voting, for example - the miniscule probability of changing the outcome isn't selfishly worth the time investment, but it's an excellent opportunity to signal that you're smart/knowledgeable/loyal. It even claims much of healthcare is signaling.
Not absolutely everything is signaling, but there's a lot more of it than you'd think.