Yet another statement that proves you know nothing of the subject.
Paying who? Quite a bit of the software inside the GPL'ed portion of Red Hat isn't even from the US. Red Hat (an American company) got it for free from someone else.
Besides, how would you suggest they pay for it? Each piece of code belongs to a different developer.
You see, Red Hat is the ancestor for at least 20 distributions. Meaning those 20 distros aren't mirror-images of RH, but based on it to a degree.
The one unifying thing about each of these distros is that they use Red Hat RPM management and tools. Thus, they are classified as being based on Red Hat. Red Flag was developed by the Chinese using Asianux as a core component and by using GPLed tools and source code that anyone building their own distro can use.
RHEL source is GPLed and made freely available to the masses, but the usable and supported form is available only to those who pay for it. White Box, which is an American distro, uses the GPLed Red Hat sources and developed it into a free Enterprise system based on RH's technology
Might I note that U.S. based Oracle has a 58% stake in the Korean partner in Asianux?