MinIO is far less complex than getting same functionality on Ceph stack.

But that's kind of advantage only on the small companies and hobbyist market, big company either have enough needs to run big ceph cluster, or to buy it as a service.

Minio is literally "point it at storage(s), done". And at far smaller RAM usage.

Ceph is mon servers, osd servers, then rados gatway server on top of that.