I think you may be using "monopoly" in the colloquial sense of "dominant market share" and not in the more specific sense of "using dominant market share to prevent competition" which is the legal sense.

There is nothing about NPR that discourages other public broadcasters.

(I'm not sure I'd call Google or FB a monopoly by that definition either, despite their market shares.

> and yet we don't constantly hear about all the evil stuff they're doing

We do, though, from conservatives.