It is possible to be far from a free market economy and still not be completely communist
Let me cite Wikipedia since it's good enough here: "Capitalism is an economic system and an ideology based on private ownership of the means of production and their operation for profit. Characteristics central to capitalism include private property, capital accumulation, wage labor, voluntary exchange, a price system, and competitive markets." (https://en.wikipedia.org/wiki/Capitalism)
The word "central" here implies that this definition, or summary, does not define capitalism per se.
IMO fixing this should be the central push for the "save the internet" folks.
The ISP market is no anomaly but just another facet of Capitalism.