The helm chart in the repository includes a ClusterRoleBinding and ServiceAccount for granting cluster admin access to the locust service.
However, the cluster admin access is not needed by the locust service, since it just executes locust without any need to access any resources within the kubernetes cluster.
I just tested it on our execution plane - running the locust service without the ClusterRoleBinding and ServiceAccount works like a charm. So, the whole file helm/templates/serviceaccount.yaml can be removed.