I don’t think it’s comparable to Amazon Linux even, it’s more infrastructure oriented. From the Wikipedia page:
CBL-Mariner is being developed by the Linux Systems Group at Microsoft for its edge network services and as part of its cloud infrastructure.[5] The company uses it as the base Linux for containers in the Azure Stack HCI implementation of Azure Kubernetes Service
Love their ‘terms of service’ and complete lack of privacy policy (at least for me, the link is not showing any policy). Whoever pays for this nonsense gets what they deserve.