MinIO the corporation is not the sole licencor of MinIO the source code. They could sue and probably enforce compliance, but they can't just revoke the license like it is an overly restrictive commercial EULA.
They absolutely can revoke the license on all their own code, or any code signed over to them with a CLA. But really, they don’t have to revoke anything. The license does that automatically: you’re only allowed to redistribute GPL/AGPL licensed software as long as you comply with the terms. If you stop complying, the license ceases granting you permission automatically.
