Xfce 4.20 Wayland on the way but need times…

No, I don’t think so, as Red Hat only source revenue is RHEL and cloud, not fedora. And RHEL still open source, just you can’t get the builded binary from red hat, but you can build it yourself, as open source means the code is available for public, and it’s available for public, and most of the codes are in CentOS stream, https://gitlab.com/redhat/centos-stream/src

And most of the Enterprise linux downstream could inspect and use rhel code, just the binary and how to build is restricted, it’s still adhere with the GPL/LGPL in my opinion

Fedora Xfce is also great on old HW, and have SELINUX if you are paranoid with security.