: By entering a CNIC number, the database reveals every SIM card registered under that specific ID, along with the owner's permanent details.

You could frame it as:

Many sites ask you to "enter your number to check if you are in the database." Once you do, they capture your number and sell it to telemarketers or scammers.

: Many websites or apps offering "Spy Eye" access are "honeypots" or contain malware/adware designed to steal the user's own data.