This is interesting. I've recently been doing quite a bit of research into what my "future stack" is going to be for backend. MinIO regularly came onto my radar but one heuristic (among many) I use to determine which software is TRULY open source and which is far less likely to remain open source is whether they even provide a link to their Github page and prominently display it on their website. MinIO was triggering my "not really open source" radar for this reason.
I'm still dabbling but have kind of latched onto the idea of using Ceph. To my understanding they were acquired by RedHat, and the project has all the signs of real open source, including the fact that it originated as a doctoral research project at the University of California, Santa Cruz, with initial funding from the U.S. Department of Energy.