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Wasn't that right before WhatsApp was bought though? From what I remember they made an effort to implement E2EE before Facebook had any say in it.

Nope, it was implemented after purchase. It's been (optional) in messenger too for almost as long.

Facebook Messenger has had (opt in) E2EE since 2017 I believe.

They're starting to enable it by default recently

2014 was also the year Let's Encrypt was founded.

Truly game changing.

Curious how it benefits Meta