"wrong tool for the job" - What is the right tool? If it checks all the boxes compared to Minio, and outperforms Minio, it is not unlikely to be used. Minio itself was originally FOSS after all, and it is not without its problems. I'm sure there's many devops folk that welcome an alternative.
AWS (+ S3) is cost prohibitive for many workloads, even at Fortune 500 scale. Plenty of opportunity here.