Only people you have saved in your address book can see your DP.

: Users can restrict their profile photo visibility to "Everyone," "My Contacts," "My Contacts Except...," or "Nobody". If a user is not authorized to see the DP, WhatsApp's servers simply do not deliver the image file to that user's device. Screenshot Blocking

Using third-party "modded" versions of WhatsApp (like GBWhatsApp) can lead to a permanent ban from the platform.

Websites claiming to offer "Private DP Viewer" services generally fall into three categories of deception: How to change your privacy settings | WhatsApp Help Center