Intent is incredibly important. In all systems trade happens. The idea that capitalism=markets is incredibly stupid, equally stupid is the idea that all work is done under a corporation for the sole purpose of making someone else rich, as you have suggested here.

The problem is not that things are done for the sake of the state or not, but what purpose things are done for. In fascism the state is owned by corporate interests, the leading interest being whatever dictator sits at the top. Work is done solely to make those corporate owners privately rich, nothing more. Each system is built openly for class oppression.

Even in the most brain rotted American views the ussr is nothing like that. You'd have to be a fascist or brain damaged to even try to argue it.