I think what sets Red Hat apart from companies like Microsoft, Google, Apple, etc. is that those do have a lot of open source code, and it's an important piece

I think what sets Red Hat apart from companies like Microsoft, Google, Apple, etc. is that those do have a lot of open source code, and it's an important piece of their strategy, but their most critical code is not open source. And not just the most critical code, but most of their code is not open source. Open sourcing some strategic things makes sense for them. But for Red Hat, open source itself is the core strategy, and they open source everything.