[Quessked73]

In the case of FB, I actually believe having Instagram and Facebook not e2e could be even work, if people are educated and made aware about it, while Whatsapp remains e2e.

Instagram and FB are mostly "public" facing so they offer a big surface for malicious activities. (Scammers, Groomers/People seeking CSAM which are always used as a reason for more surveillance/ Trolls etc.)

Whatsapp is more private and requires knowing one's phone number which ideally should be harder to get ahold of.

Messaging on Instagram/FB could be compared to whispering in a crowded place, private...but not fully private.

In an ideal world this would not be necessary, but there will always be a fight between surveillance and freedom. And perhaps giving up freedoms in some parts could allow us regain more freedom in others, as long as people are aware about it, which might be the biggest hurdle to tackle.