aspects of dedication
Oracle does a lot for specific open-source projects, that are of great benefit to the industry as a whole. Yes, there are a lot of people who have negative experiences with Oracle as a company, but that doesn't diminish the good that is done.
Oracle employs an XFS maintainer. People use XFS because it's fast, and Oracle's improvements have addressed problems and are bringing extensive new functionality. As a rising tide lifts all ships, a rising filesystem lifts all databases.
https://blogs.oracle.com/authors/darrick-wong
Oracle really holds the Linux filesystem landscape in its hands, via their influence on XFS, btrfs, and ZFS. I don't agree on their direction with this (and a lot of people have a problem with it), but IBM certainly didn't do this.
"Chris Mason, an engineer working on ReiserFS for SUSE at the time, joined Oracle later that year and began work on a new file system based on these B-trees."
https://en.wikipedia.org/wiki/Btrfs
Oracle has done a lot with NFS over ONC RPC, one result being RFC-9289.
https://www.rfc-editor.org/rfc/rfc9289.txt
In summary, there is a lot going on with Oracle contributions (and their lack). It's not as simple as some might assert.