Domain Data Guard was launched at early 2014 to fulfill the demand of affordable privacy protection service which is comply to ICANN's RAA.
Revealing your private informatin on WHOIS page is considered unwise as your private information (name, home/office address, email address, phone number) might be used by other party for any unsolicited purposes.
Protect your identity, don't let your private information displayed publicly on the WHOIS result and seen publicly.