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At the end game, TPTB push all their zombies that use Coinbase, Circle, Paypal, Facebook, etc into a pegged side chain which is a centralized ledger with world bank control over the debasement rate. MP's defense plan is destroyed by the pegging.
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Bitcoin as a backing for sidechains is eminently compatible with Bitcoin as MP's personal wealth playground.
I dunno if MP is a fraction of the Mr. Big that he and his minions proclaim but I suspect there is at least something to the assertion. Certainly they are active and certainly they are among the most technically competent and economically literate of the ecosystem participants.
Last time I was paying much attention (early 2015 iirc) MP's seemed fairly allergic to the idea of the masses benefiting by Bitcoin and to the extent that they might by using a Bitcoin-backed sidechain and he seemed to have some resistance for that reason. I wrote it off to his psychological need to broadly advertise himself as the worlds biggest prick. I suspect that this need will take a second seat to his recognition that sidechains working as advertised give him vastly more power than vanilla Bitcoin alone. One way or another, Hearn's fork is a genuine threat to him (and humanity) and something worth fighting off with as much energy, cost, and collateral damage as necessary.