Whatever this product is I feel the name is already a hindrance. Normal products don't have privacy in the name. Rightly or wrongly you will be judged when you say 'btw I use ... Privacy...'.

The product should have strong privacy built into it and a commitment from the owners to keep it this way. Calling it something mundane and then competing on the merits of the product will favor mass adoption.

How many users of WhatsApp really understand the implications of E2E? Would they have installed it if it was call 'Chat App Privacy Pro'?