That's libelously untrue. You might think Ceph or Swift are better, that's fine, but it's no toy. I've seen a few toy S3 implementations. I even called out Zettar on my blog back in the day. If it's not scalable or highly available it's a toy. If it's unstable it's a toy. If it's super-duper slow it's a toy. Minio is none of these things, plus it has features like erasure coding and encryption that are mature enough to be backed by real support. Best ever? I'm not saying that, but it's no toy.

Disclaimer: I have no affiliation with Minio. In fact, they're very nearly a competitor with the project I work on. However, Minio is full of ex-Gluster people and I consider many of them friends.