Where I live, a graduate with an MBBS degree (Master of Medicine, Master of Surgery) is called a doctor. To me, strictly speaking, he is a doctor only...
In computer networking, a virtual storage area network (VSAN) is a collection of ports from a set of connected Fibre Channel switches, that form a virtual fabric. Ports within a single switch can be partitioned into multiple VSANs, despite sharing hardware resources.
Yes there is a policy applied by default to all VMs on a VSAN datastore but you cannot see this policy within the vSphere UI. You can see that a default policy is defined to various classes using the following command: esxcli vsan policy getdefault.