I was thinking about the effects on GPU prices that gamers are pissed off about and all the bad that Bitcoin and Cryptocurrency currency cause with the crime and environmental impact. There are millions of gamers around the world with powerful gaming PC's, if they started a mining pool they could at first start attacking some of the smaller Cryptocurrencies. An encrypted wallet that no one can withdrawal from could be used and the mining rewards could be used to post useless transactions to take up block space.

As mining power grows as more people learn about the project, they can start performing 51% attacks to further disrupt the network. Eventually that crypto will collapse and they can move up to larger ones till they get to bitcoin. I don't think they would even have to target bitcoin because eventually trust would go down as publicity picks up the story and everything collapses for the better.