As an example, after using kn to create a service as follows:

kn service create kiosk-encoder --image markito/qr-encode:v1 -n markito-live

On a cluster with Knative OpenShift Ingress [1] installed I can already access the service url as displayed by kn service get.

kn service get |grep -i kiosk-encoder
kiosk-encoder kiosk-encoder.markito-live.apps.openshift.codeready.cloud 1 12h 3 OK / 3 True

[1] `oc apply --filename https://github.com/bbrowning/knative-openshift-ingress/releases/download/v0.0.1/release.yaml`

Acceptance
When a service is created in Knative when running in OpenShift, it should be accessible through an URL without any extra (manual or not) step.