Earlier quoted context omitted.
You licensed the code as MIT - https://github.com/ofek/csi-gcs/blob/master/LICENSE-MIT Are you saying you have an issue with them copying your MIT licensed code?
Yes, copying the code without following up to actually collaborate or even forking to show attribution I think is bad practice for such a large organization, or any entity for that matter.
You can absolutely berate them for copying without attribution, but that's it; they don't owe you anything else.