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The hacker can't sell off his ETC. I don't know yet whether ETC will go to the moon but I definitely don't expect it to crash now.

Why cant he sell off?

Honestly, I shouldn't be giving you advice because I am not that knowledgeable about the topic. But from what I understood from reddit is that they managed to get the funds of the hacker to an address outside of DAO and he therefore lost control over the stolen funds.