Yes, Free Market is just as much of a fantasy as actual working Communism is. For Free Market to work the consumer would need absolute awareness of everything at all times in order to make an informed decision, this is obviously outside the span of human ability and hence Free Market is inherently impossible to achieve. Without a large state to control it it'll ALWAYS end up with oligopolies and market collusion to fix prices high, keep quality low and to strangle competitors in the bud.