[Dah00n]

What Big Tech really wants is metadata. Metadata and which images are sent isn't encrypted. So this is E2EE minus what Meta wants to see. If one cares about privacy, one cares about metadata. Access to metadata equals poor privacy and is fluff encryption at best.

[Tutanota]

Absolutely right, and for that reason most tech-savvy people will still not trust Meta with their data. But that they start encrypting end-to-end is a good thing, regardless.