Economically, network media are accompanied by a form of commodification which, as we shall see

Economically, network media are accompanied by a form of commodification which, as we shall see, constitutes a parasitic reversal of the kind of commodification which typifies broadcast.

Hi everyone
I could not see what parasitic reversal means? Thanks in advance
Source: Communication Theory; Media, Technology and Society belonging to David Holmes
The economic interrelationship
A fourth continuity between the broadcast and network architectures is
the way their economic logics presuppose each other. Economically, network
media are accompanied by a form of commodification which, as we
shall see, constitutes a parasitic reversal of the kind of commodification
which typifies broadcast. The form of commodification which is peculiar
to a first media age is intertwined with the ever-expanding dimensions of
advertising