Yeah, another nice use case is using it at your local dev environment where you can use a single lan IP or even loopback IP and have many domains to differentiate your services mirroring the actual DNS hosted version without messing around the hosts file or local DNS server records. Since their subdomains also resolve to local IPs, you automatically get infinite local address subdomains. As long as you don’t mind it’ll resolve via remote name server but they won’t be able to reach back to your local IPs anyway.