Is every relationship either symbiotic or parasitic

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"Symbiotic relationships, both parasitic and mutualistic, are ubiquitous in nature."

"Understanding how these symbioses evolve, from bacteria and their phages to humans and our gut microflora, is crucial in understanding how life operates. Often, symbioses consist of a slowly evolving host species with each host only interacting with its own sub-population of symbionts. The Red Queen hypothesis describes coevolutionary relationships as constant arms races with each species rushing to evolve an advantage over the other, suggesting that faster evolution is favored. Here, we use a simple game theoretic model of host-symbiont coevolution that includes population structure to show that if the symbionts evolve much faster than the host, the equilibrium distribution is the same as it would be if it were a sequential game where the host moves first against its symbionts."

He's talking about Google, right? 

(I'm trying to understand James Damore — not just why he was fired, but why he was hired.)