The Whois information of the domain is obligated to be published by ICANN（※）.
ICANN（※）it is a private non-profit organization that aims to coordinate various internet resources such as domain names worldwide.
The ICANN Registrar Certification Agreement stipulates that all registrars disclose their domain holder's data (Whois data) without monopoly. Therefore, the Whois information for your domain will be disclosed regardless of whether you are registered with any ICANN-approved registrar, including Z.com.
In recent years, as the number of domain registrations has increased, there has been an increasing tendency to consider domains as "intellectual property." Whois information is generally displayed in order to smoothly resolve disputes arising from different domain holders and trademark holders.
In order to smoothly resolve disputes arising from different domain holders and trademark holders, it is common to disclose Whois information.
