If this is true bitcoin will fail. nostr:note1z0tre0e69tykk4e9lf52rqll3etfwg5qpedm9qkjjdz4x0l22flqgl3fe2
No it's not.
You don't have to have high hash rate.
And you don't have to care for miners.
Difficulty can go down.
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https://www.cs.princeton.edu/~arvindn/publications/mining_CCS.pdf