A long read article by Alex Gladstein is chief strategy officer at the Human Rights Foundation, a non-profit that supports civil liberties in authoritarian societies.
Link to article:
https://usdtalk.com/thread-114.htmlNo they couldn't, not unless there is a single transaction is going on the network, there are still miners even if he is alone. I think they will be having a hard time doing so, and if the y managed to there should be another coin that would taking its place. And the cycle of stoping another coins is infinite.