They're all economic entities. They're not all equally important. What coinbase and other exchanges consider to be the "true" bitcoin matters a whole lot more

They're all economic entities. They're not all equally important. What coinbase and other exchanges consider to be the "true" bitcoin matters a whole lot more than what some guy who just installed a bitcoin node on his raspberry pi thinks is the true bitcoin. In the end bitcoin is worth what people are willing to pay for it. Even if you have the majority of the nodes if nobody accepts your forked bitcoin then it's worthless.