#2 is interesting. I am very curious what the ultimate plan for having 2 messaging apps is (at least in Zuck’s head). My bet is that his fantasy is to eventually merge them into a single service: Meta Messenger.
They could do this very gradually. First rename WhatsApp to Meta Messenger. Keep everything else the same. Then with interop being implemented slowly merge FB messenger into Meta Messenger.
1. liability reduction
2. interop with WhatsApp
3. marketing
4. added security for their users :D