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That doesn’t sound like a “hard promise”

You need support of the miners to effect a change on bitcoin, they won't support a change which is contrary to their interests.

not Miners, Users. The Users with their own Node govern the rules of Bitcoin. The Miners are bending to our will.

Wasn't that on Ethereum? My impression is that it has very different governance/promises.

Governance on ethereum is the same as bitcoin, regardless of what bitcoin maxis want you to believe