You are correct. However the rules are determined by what the majority of miners say the rules are. If the miners decide to change those rules and they have eno

You are correct. However the rules are determined by what the majority of miners say the rules are. If the miners decide to change those rules and they have enough others who agree with them then they can do so. And the economic incentive for everyone else is to agree with that or get left on a worthless network or a greatly decreased in value network. The economic incentive is that if you play nice with others and follow the majority ruleset then the coin that you mine will be worth something.