if containers in your Kubernetes workloads are not configured to run as high UID then the chance of privilege escalation increases provided container is compromised.
UID 1000 is assigned to first non-root user. Therefore, it is recommended to set the parameter 'runAsUser' to a higher value, that is, more than 10,000. this will ensure that if a process attempts to escalate privilege outside of the namespace, the process will still run as under-privileged.