Excellent reminder of why 'useful PoW' is a very bad idea. Furthermore, the value of 'useful' may vary over time to the point where it exceeds the value of mini

Excellent reminder of why 'useful PoW' is a very bad idea. Furthermore, the value of 'useful' may vary over time to the point where it exceeds the value of mining. That is when a 'useful' corporation takes over mining and decides to kill the chain because 'useful inc.' is promoting its own corporate token (another bad idea: bad ideas generally lead to other bad ideas).