Machmas Mitzvah? 
That one’s easy: Some people consider crypto the biggest mitzvah ever! Hence me saying depends who you ask, for some people it’s a Mitzvah, for other people it’s a Keli shemelachto l’issur, for other people it’s a Basis for other things that are assur, for other people it’s muktzeh machmas gufo (not a Keli, serves no purpose), for other people it’s repulsive, and for other people it’s too expensive or dangerous (chisaron kis)