You know that RH employees actually work on OSS, right? They're a major contributor to the open-source world, they have a community of enthusiasts (Fedora) and everything goes to upstream.
I say that since we're discussing the GPL above.
If Red Hat vanished tomorrow, Linux would still be developed and maintained, even though it would suffer a setback. That's because there are many other companies and communities that help with that.
The problem is that only Red Hat earns serious money directly from selling Linux licenses, although it relies on contributions of many other companies and individuals to do so. The other companies only earn money from complementary products and consulting services ... services which don't scale unless you're a superstar developer charging $500 / hour or you have lots of resources to hire lots of people to answer support calls.
Although they shouldn't care since they are a company, and I do appreciate their contributions, the culprit is from my pov the GPL license ... and the perfect open-source license is LGPL-like ... that's all I tried to say.