Ceph is an open source project run by a foundation. Minio is a company backed by VCs looking for a return. There is also seaweedfs, powerscale, openstack swift and hyperstore. The S3 compatible space is crowded.
Curious about one thing - does Ceph's s3 compatible api support oidc based auth? We used to use this with minio before switching to aws s3 and using presigned URLs.
As a user of Ceph it does feel like a truly open source project. Redhat/IBM do sponsor a lot of work on the project but there are lots of other contributors. I have contributed maybe a dozen changes myself and it was quite easy to do and the maintainers are fairly responsive.
