And RHEL is also not free. So where do they save money compared to Windows? In that case they will be supporting FOSS but not due to it being good "for them" but out of a moral high ground.
Yeah, RHEL is one area I wouldn't spend the money on desktop deployments - CentOS is a much better choice here (it's $300/year for a RHEL Workstation license with support, you can get self-support desktop builds for $50/year but why not just use CentOS at that point).