In an earlier thread, some Oracle guy (not in the Oracle Linux team) mentioned that Oracle 8 actually builds from CentOS 8, rather than RHEL 8. I was a bit skeptical, since OL 8 usually releases much earlier than CentOS 8, but couldn't verify things either way. Someone else mentioned that RH actually only releases RHEL8 sources through CentOS8 sources. Again, I don't know how to verify, but if true they raise a lot of new questions about Oracle Linux 8 given the recent CentOS 8 announcement.