Miners run the show. People are claiming economic nodes like Coinbase or other exchanges determine the longest chain - they do not, nor do users. All they can do is sell coins
In hopes of influencing the price in an attempt to disagree with the miners. Only in a case where the miners do something absurd like increase supply of coins would this be effective
A good example of this is Coingeek exclusively mining BCH - if they followed the market, they would mine BTC for more profit, but they have too much resolve despite 'market forces'
We can also see them matter since BTC has more hashrate than BCH because of higher price. User (nodes) vote with their money.
