Your title made me think this topic is related to bitcoin mining but I shouldn't probably be surprised that the message is different.
It must be good to feel idealistic but what you are asking probably won't turn into a reality. Even if you are able to organize a small group and raise a small fund, under what authority are you allowed to take down exchanges? Are you going to bypass local authorities who gave them the license to operate?
I would rather help bring down the dependence on centralized exchanges by using decentralized exchanges or other P2P platforms then encourage fellow traders to do the same.
Local authority is zero If they dont stop Criminals!!
If they dont stand for justice they have no authority.