Companies tend to deceive customers, as the incentives are frequently aren't aligned, so "voting with a wallet" is not functioning as well as it should. And profit-seeking leads to market consolidation, which, at least past some threshold is a net negative on society and turns into oligopoly.

A vision of a society without a government is utopic. It requires drastically different mindset and understanding of the side effects and unintended outcomes from every living person. Yet, I cannot help but naively like the idea of such society (which is entirely subjective thing), and so I wish we all could be smarter and knowledgeable, stop fighting for resources, and that some distant day whatever becomes of us may live in a world where cartels won't form because everyone understands how that's not really in anyone's interest (paradoxically, I believe that's not even good for the cartel itself in the long term - power and wealth are also a deadly curse).