How so? Why would an owner of a market with physical dimensions, held every Saturday or whatever, be any more or less responsible for what changes hands there?
if the owner of a market isn't actually dealing drugs, whether the market is physical or electronic, that is different than if the "owner" of a street corner is either dealing himself or actively supervising those who are dealing for him
if the owner of a market isn't actually dealing drugs, whether the market is physical or electronic, that is different than if the "owner" of a street corner is either dealing himself or actively supervising those who are dealing for him