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I'm not sure, but it looks to me like a self mining attack that allows the network to be attacked with only 1/3 of the hash power.
How is this an attack to the network?
I was referring to the fact that a mining pool like foundry is close to 33% or 1/3 of the total hash rate, which allows a selfish mining attack. Majority is not Enough: Bitcoin Mining is Vulnerable
https://arxiv.org/abs/1311.0243.
Thanks for the explanation.