Because Google Cloud already has had IAM for some time: https://console.cloud.google.com/iam-admin/iam https://console.cloud.google.com/iam-admin/iam As with A

Because Google Cloud already has had IAM for some time: https://console.cloud.google.com/iam-admin/iam https://console.cloud.google.com/iam-admin/iam As with AWS IAM, it manages access to the infrastructure, like your machine instances. But this new Google thing, as far as I understand, is about giving other (potentially non-technical) users access to your corporate resources using single identity.