They spy on you!

WhatsApp:

steals your address book

reads all your texts

analyzes your photos

listens to voice messages

Users can be spied on via WhatsSpy public

All thoose infomations go to Facebook and Instagramn. And they show you idividual / personal Ads.

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Discussion

Exactly!

He can take pictures.

Record audios and videos without the user's consent.

Use your contacts.

And search your file system.

Messages are e2ee. There's no way to turn it off that I can see. The backups are held by Apple or Google. Maybe they're just using the meta data associated with your device and the things you search for on other apps.

Messages are e to facebook and facebook to e encrypted.