I am guessing here but I do understand why they want people to open source the management code of minio and in some cases how it is integrated into a product. I understand that AGPL might not be written for these requirements but I think it is time for a new such license.
If it is part of a SaaS product that is sold I can definitely understand why this is important.
> "When MinIO is linked to a larger software stack in any form, including statically, dynamically, pipes, or containerized and invoked remotely, the AGPL v3 applies to your use. What triggers the AGPL v3 obligations is the exchanging data between the larger stack and MinIO."
It does matter, since the current AGPL license status is questionable at best, they did not have permission to relicense code added by contributors. This is why CLAs exist.
If you don't have a CLA you just end up with the new changes being AGPL which creates a mixed license amalgamation which in practical terms regresses down to the stricter of the licenses which would be the AGPL.