In order to secure DevWorkspaces on a cluster one need to set up the multitenant access

• pods from CRW operator namespace can communicate with the pods in the user namespace
• pods from the user namespaces can communicate with the pods from the CRW operator namespace
• pods from user A namespace can NOT communicate with pods from the User B namespace

Useful article: https://docs.openshift.com/container-platform/4.8/networking/network_policy/multitenant-network-policy.html