The rules can&#x27;t actually be dictated by the miners - e.g. they can make invalid blocks but clients won&#x27;t accept them. They can censor transactions, though that can only delay it until a non-colluding miner includes it.<p>The Bitcoin XT chain fork is a bit different in that it explicitly tied itself to miner voting. That&#x27;s not necessary, you could really tie it to anything.