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They could, but it would be easier to shift to a pre-existing blockchain. The reason for using Bitcoin is presumably security.

Dynamic fees would certainly help with the pending withdraw situation. That was one of the most common complaints in the trollbox.

Do you mean on Poloniex? I don't think they said that was the reason for the manual confirmations but it could be. Had never considered that.

Yes security was the main reason, however dynamic fees would help speed up the process.

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