TL;DR
The new system will have state encryption and WhatsApp will no longer be used for communication.
(local source: [1](https://g1.globo.com/politica/blog/octavio-guedes/post/2023/09/06/inteligencia-brasileira-vai-aposentar-whatsapp-diminuir-influencia-militar-e-incluir-governos-estaduais.ghtml),[2](https://www.tecmundo.com.br/seguranca/271397-sistema-inteligencia-trocar-whatsapp-plataforma-igual-urnas.htm))
In here whatsapp is omnipresent, used for everything & everywhere, no distinction whatsoever, if you don’t have it you’re cut off, doesn’t matter if it’s public or private