Yes, but if the whole thing topples over because it's compromised in a 51% attack, they're not making that profit anymore. This part is curious to me.
Getting 51% is actually pretty difficult.
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I hope you're right. I'd sleep better knowing that these multi-exahash miners were at least thinking about it. Hopefully they are, but my experience talking to a few of them wasn't encouraging. If they aren't, I just want to make sure someone in the know is communicating with them.
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