Monopolies create dictatorships and vice versa
If a company has total monopoly over something, then they get to dictate within that space; and if that space is a town, then the people living within that town are, de facto, living in a dictatorship. Many examples like this are present in history: mining towns, industrial towns, and so on; places where most of the jobs belonged to a single corporation.
We had this kind of dictatorship in agrigulture aswell;examples like the cotton plantations of the American South, the people working those plantations were living in a dictatorship, where they had different levels of freedom depending on their skin color and their professional employment and skills.
In dictatorships, like current day Communist China, the Party decides what corporations do or don't, there is no real competition, and no freedom for anyone that is not part of the ruling elite; thus, most of the population is living in a dictatorship similar to that of the cotton plantations of the past; the ruling communists, that are predominantly han chinese, exert dictatorial power over the other ethnic groups, and over all other ideological groups.
In both, dictatorships and monopoly holding corporations, there is no real freedom, no conversation, no dissent. In both the ruling elite are the keepers of 'the truth', and the only ones allowed to speak of truth.
Censorship is the norm in dictatorships and monopoly holding corporations, and anyone that dares speak out, or worse, dares do something about the oppression, is 'dealt with', in a more or less legal manner, thus ensuring the perpetuation of the status quo.