You know how mega uses encryption. Do you think encryption can ever be used in a similar way to mega but for dark net markets? Sounds quite silly but do you think it might ever be a possibility? So the people who run the market won't get in any trouble.
No it will never be legal. The DNM and admin are treated like organized crime. That's why DPR is being charged with selling drugs, fake ids, credit cards etc. Even though he didn't personally sell anything.