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I think more likely they started cashing out on Poloniex and the developers shit a brick when they saw the steem price falling. All cryptos crashed last week, so maybe the devs misinterpreted the fall and thought hf19 was a mistake and they're rolling it back. I'm just guessing here.

Very sad, well Poloniex says wallet issues will be resolved tomorrow so maybe people will bring over some steem and power up