Also, if a subscription WAF instance expires, you can terminate the WAF service to release the instance.
Background information
Note Before you can terminate the WAF service, make sure that the DNS records of the websites
protected by your WAF instance point to the origin server. After you terminate the
WAF service or release your WAF instance, all the configurations of the websites are
deleted. If a request is still redirected to your WAF instance, the request cannot
be forwarded to the origin server, and the access fails.