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Fedora has a build system for PPC and will continue to do builds and releases depending on how much of the community steps up to do it. IBM is part of that community for example and can participate just like any other volunteer.
RHEL has to do extensive QA in-house for RHEL regardless of Fedora and testing focused on enterprise features tend to be quite different from what the community tends to care about. They are essentially two different although there is some overlap.