> Perhaps it is, I don't have enough insight to know.

You can spot it in this post, too.

> Is it actually a free market argument?

The argument is:

Large corporation A offers service B at price $C. $C is an extravagant amount, and is due to the greed and inefficiencies of A. A can only charge $C because of regulatory capture, or using capital to elbow out upstarts, or whatever other argument you want to assume (ie it's not a truly free market).

If A should leave the market (forcibly or not), company D can now flourish by offering B at $E, where $E is much less than $C. Because D doesn't have the inefficiencies and greed of A, everyone profits.

Seems like a pretty standard "free markets/Econ 101" argument to me.

> Honest question: Why?

Frequently it’s nothing more than a flimsy pretext for cowardice, a lack of knowledge, or simple indifference.

I don't disagree with you, many topics are complex. Generally though, people dislike those who refuse to take a stance even if it's a weakly-held one (thus Machiavelli's famous advice).