As per the command help, it should "Execute cluster-wide operations only" (install necessary camel-k CRDs).

However, when executing kamel install --cluster-setup, it also creates a new subscription in the current namespace (and thus also a new operator deployment):

oc get subs
NAME              PACKAGE           SOURCE             CHANNEL
red-hat-camel-k   red-hat-camel-k   redhat-operators   1.8.x