How does this .PK Whois Web Service work

How does this .PK Whois Web Service work?

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Disclaimer: Please note we do not have any affiliation or link with PKNIC (The official .PK Domain Registry) whatsoever. The code and this service is provided as is without any warranty and for public service only. Any illegal use of this service may result in suspension of your account/service and/or may be prosecuted legally. You can use this free service according to our terms and condition as you agreed during download/signup of our code. For domain registration and other domain related policies you must follow PKNIC policy and may contact them directly. You are obliged to mention "Whois.Net.PK" name and URL at your website if you agree to use our free services. The Whois Web Service, API code and any other related document/code downloaded from our site(s) are legal property of PAKNIC.COM. By using our service and website, you agree to our terms & conditions as listed on the website.

pknic.net.pk claims that running google ads on this website is putting un-necessary load on .pk registry servers, the reason they block our IP Address. Apparently it should put load on the web server and not on the registry servers, but to keep this free service running we are removing google ads in a good faith.
About pknic.net.pk blocking our IP Address @ Yahoo forum