Any chain can exist with a single miner on it, and anyone can be that miner. Users do not need the consent of miners to execute a hardfork and migrate to a new

Any chain can exist with a single miner on it, and anyone can be that miner. Users do not need the consent of miners to execute a hardfork and migrate to a new chain. Miners do not control or determine hard forks. This has been demonstrated empirically numerous times in crypto history, most notably the moment that >80% of the hashrate openly supported a hardfork that subsequently failed because it did not have user support. Your node software decides what fork you run on. If someone can push an update to your software without your consent, they can choose to put you on a fork and you may not even realize it happened. This is why most full node software (including bitcoin and Ethereum) does not support automatic updates.