Bragging about E2E encryption while feeding the Facebook data monster IMO is a bit like bragging about how you transport your slaves in armored vehicles:
Yes, they are safer against robberies.
No, [given my current threat model] I'd still prefer driving something less secure that isn't abusing my every action [and every action of everyone I communicate with] for the profit of Facebook.
Edit: clarifications, in square brackets and below
It seems no doubt that Whatsapp is safer against an 3rd party adversary.
My points are only that
- I consider Facebook an adversary at this point,
- I don't belive they bought Whatsapp and removed the fees because of the goodness in Mark Zuckerbergs heart,
- I don't believe they would update their privacy policy if they somehow thought they could get away with what they are planning to do under the old privacy policy.