Maybe because moxie marlinspike keeps telling the general public WhatsApp is using signal? Which is bullshit... because WhatsApp isn't auditable, it admits it uses metadata collection, it has the ability to cache identical messages (supposedly notnpossible with unique encryption keys, right?) amongst a host of other super suspicious shit. Now Facebook can audit the content of those messages, well big fucking surprise it's not private or the same as signal then is it?