What do you mean by privacy hardened? The messages are going through Facebook’s servers, so there’s very little you can do in terms of privacy for your conversations. If you want to limit its ability to touch your things on your phone, track you on your phone, be able to use your phone’s sensors, etc., then maybe a Matrix bridge or WhatsApp WebToGo on F-Droid? Honestly, I’m interested in a good alternative, because I couldn’t get the matrix bridge working several years ago, and WhatsApp WebToGo has issues staying connected and requires a dedicated WhatsApp phone that stays at home or wherever.
What do you mean by privacy hardened? The messages are going through Facebook’s servers, so there’s very little you can do in terms of privacy for your conversations. If you want to limit its ability to touch your things on your phone, track you on your phone, be able to use your phone’s sensors, etc., then maybe a Matrix bridge or WhatsApp WebToGo on F-Droid? Honestly, I’m interested in a good alternative, because I couldn’t get the matrix bridge working several years ago, and WhatsApp WebToGo has issues staying connected and requires a dedicated WhatsApp phone that stays at home or wherever.