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There is a ton of uncertainty especially when only a few exchanges are open accepting the fork. This was the case with bitcoin cash, only one exchange or another was accepting trades, and most of them were only accepting trades for those who held BTC on that exchange. I took a few days to allow everyone to deposit the new bitcoin cash from cold/hard wallets before the full market could settle on a price.

I think this will happen again, the main thing is to be ready for it.