Marcel 
So after I deleted my WhatsApp account, I convinced a friend to install #Conversations on his phone.
I don't think he would have installed it if I still would use WhatsApp.
Some things which are unnecassary complicated for DAUs and maybe prevent others from using Conversations:
- Only via F-Droid available free
=> Install F-Droid from untrusted source
=> no automatic updates (only semi without root)
- Why does #Trashserver not allow registration via XMPP client?