Red Hat bought the company that created CoreOS so it's not surprising they have Red Hat/Fedora supported versions right?
Yep, very much agree. Container Linux was still very young and growing, but had some great promise. Incorporating the tech into RHEL and Fedora was a great idea IMHO. I think CoreOS was acquired for that specific purpose personally.
Not sure. To me Flatcar brings the original CoreOS spirit..
I'm not able to find concrete examples of the differences between Flatcar and Fedora CoreOS aside from FCOS using rpm-ostree.
What are the differences especially regarding their spirit and philosophy?