Isn't the whole point of PoW that the work done is otherwise useless? I mean: you invest money (in form of your hardware/electricity bill) to mine a block, and that ensures that whoever would like to fork the chain has to spend at least as much money to do it. If PoW can earn you extra money outside of the Bitcoin ecosystem (by making the work "useful") it lowers the cost of the 51% attack, potentially making it profitable.
Hopefully between this and looming cryptographically relevant quantum computing, this whole house of cards will come crumbling down. And those who invested vast capital to burn carbon in order to evade finance regulations will lose everything. Probably not. But it’s a nice dream.
