not a sound investment proposition 
as you cannot even make a "gentlemen's agreement" for a criminal activity...
it's true however many PoW coins don't have the hashpower to withstand a serious 51% attack, they might benefit greatly from modifying their blockchains with the newer and more robust proof methods.
as you cannot even make a "gentlemen's agreement" for a criminal activity... it's true however many PoW coins don't have the hashpower to withstand a serious 51% attack, they might benefit greatly from modifying their blockchains with the newer and more robust proof methods.