Modern WhatsApp servers require TLS 1.2 or higher and newer cipher suites that the Vita’s native libraries simply do not support. To fix this, a developer would essentially have to rewrite the Vita’s network stack, which is a monumental task.
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The primary reason for the lack of WhatsApp on the PS Vita is the console's age and its Proprietary OS.
While you may not be able to run the app on the console, there is a thriving community of PS Vita fans who use WhatsApp on their mobile devices to coordinate games and share homebrew tips.
To understand why you can’t find WhatsApp in the PlayStation Store, we have to look at the timeline of the device and the app itself.