our organization was using Minio as an external S3 replacement and had contacted their sales once. When a decision was made to not go for the paid plan, we were legally threatened saying that we cannot even make remote calls to a AGPL software.
For a system that is a providing an object storage service how else are you going to use it?
We had started using it when it was Apache2 and then we got stuck. Might as well just make it into a paid product/service and not play the open source card and earn creds from community.
If you are naking open source software, you can use minio for free, otherwise you have to pay them money. If it was proprietary, that would not be the case
You also are free to study and learn from the code