I'm aware Facebook bought WhatsApp. I don't think that changes matters much though. WhatsApp is one of the "private channels" that Facebook Inc owns, and in Zuckerberg's manifesto [1] you can read:
"We are strong advocates of encryption and have built it into the largest messaging platforms in the world -- WhatsApp and Messenger."
My point is that "end-to-end encryption in private channels" and "using AI to analyze data in private channels" is incompatible.
[1] https://www.facebook.com/notes/mark-zuckerberg/building-glob...