“free markets”, the fundamental ideology of capitalism
Wrong already. The fundamental ideology of capitalism is that people with capital reap the profits (through control of means of production, but also means of living). You can shorten that to “rich get richer”. But nothing related to markets.
In fact, there were several instances of capitalist economies without a free market. Nazi Germany comes to mind - the government bought weapons, supplies, and everything else, but they were contracted from private corporations controlled only by “desirable” individuals. Other wartime economies apply here too, to a lesser degree - with rationing but still private ownership.
And yes, capitalists are always afraid of a genuinely free market, because they don’t want competition.