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Re:Nothing Is Cheaper Than Proof of Work (2015) by colordrops on Saturday February 24, 2018 @12:33AM (#16451890)
The difference is that there is that anyone can create a pool without permission from the other pools. There are subreddits with more than 21 mods that have been easily infiltrated and taken over. You can't socially engineer a mining pool
Re:Nothing Is Cheaper Than Proof of Work (2015) by Zenbit_UX on Saturday February 24, 2018 @12:44AM (#16451927)
While I appreciate your questions I get the feeling that your trying to poke holes in a very well researched and funded project based on what you read of it in my comments.

There's much more to the project and a lot of brilliant people with over a billion dollars in funding making sure this thing is bulletproof. So if you're interested in learning more about it I'd recommend you read their whitepaper as it will be a much better source of information.

However to quickly answer your comment, the 21 are elected by vote and are easily replaced by vote from the users they serve.