Oracle does a have a point though, they did release ZFS and BTRFS as open source projects. Granted, RH has done the same with other software packages, but not something as important as a FS. ZFS was a finished product, BTRFS not so much, but still, these 2 are greatly valued in the open source community.
Not siding with Oracle, I don't like them one bit, but facts are facts 🤷.
Oracle's implementation of ZFS is Proprietary software. The original version was developed with an open source model By Sun microsystems, which was bought by oracle.
And Oracle contributing to the Linux Kernel with BTRFS isn't that ground breaking
RedHat are key contributors to a stack of open source projects aside from the kernel itself. For example they are one of the lead contributors to QEMU, far ahead of Oracle.
They were always IBM's front for open/free code and the undermine of linux. Grew economically more than any Op.Fr. project because of IBM's consulting and training subcontracts passed under the table. Eventually they were absorbed by their mothership.
Linux supports loads of filesystems. ext4 works well for most people and is considerably easier to use without jumping hoops for Oracle's deliberately misaligned license for ZFS.
Everyone knows that, and everyone knows that BTRFS was released under GPL to restore the balance (as well as have the FS maintained and developed for free).
My point was, Oracle has contributed as well as RH. They offered to make RHEL instead of RH, RH do repacks. IBM is just greedy and we have seen where these sorts of things lead, to a dead company.