"Free market" is about freedom to enter, participate in, and exit the market. So things like monopolies and artificial barriers to entry are anti-free market.

Net neutrality is policing specific legal vs illegal behaviors, similarly to environmental protection laws. A "free market" doesn't really (at least not publicly) allow illegal services, because the action itself is illegal, both inside and outside the market offerings, so it is relatively orthogonal.

Certainly the maximization of profit (which has little to do with free market operations, but more of lock-in) would be helped if they were freely allowed to pursue any illegal activity in the name of profit. But it is the realm of the government, not the market, to decide what should be illegal for everybody including market participants, to mitigate predatory actions and destructive externalities.