Oh ok! The securing of the quality of "store of value" of Bitcoin - is not the securing, then... (check with Google how well the quality of "store of value" was in pair with some successfull 51% attacks)
Right yeah, definitions are important. I'm using the term "security" in the classical sense - protection of my UTXOs from malicious actors. Agreed that in this 1 miner scenario all sorts of other things such as predicability, finality, fiat exchange rate etc could all be out the window.
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