People who use WhatsApp -- are you sure it is end to end encrypted or do you think FB are saying that to save face while just reading the messages for insightfu

People who use WhatsApp -- are you sure it is end to end encrypted or do you think FB are saying that to save face while just reading the messages for insightful keyword trends? It wouldn't shock me to learn this kind of lying from big tech companies is common. If Google do it why not Facebook or other big tech companies. At least Apple have shown it in their financial interest to keep your data private. Not so for the ad companies.