It’s zero-sum when the game ends because there are no more buyers. That hasn’t happened yet. We don’t know how much more money will be spent on Ethereum or who

It’s zero-sum when the game ends because there are no more buyers. That hasn’t happened yet. We don’t know how much more money will be spent on Ethereum or who the buyers will be. We don’t know how much they will win or lose. If it’s zero-sum but we don’t know how many terms are being summed or their values, then we can’t do the math and the equation isn’t very useful for making predictions.