If the network is free to join, then others who are not in the cartel will want to join in order to "eat their lunch."
They can't. I already told you that you wouldn't have enough hashrate unless you were a member of the cartel monopoly that is able to charge the cost of mining to the entire population via the capture of the sovereign bond-fiat connection.
What do you think KYC and 9/11 is all about?
You are socially myopic.
Edit: don't forget a monopoly can also raise transaction fees but withhold transactions for the minority miners. I (AnonyMint) described this attack in 2013 (Transactions Withholding Attack).