While I salute your idea and product I fear that the masses will probably not be interested. Why you may ask? Just look at all the sheep using What's App, Facebook etc. People don't give a **** about their privacy.
Yes but companies will find it very interesting. A lot of money is spent on ensuring companies can keep their data private.
Think of all the internal chat systems, emails and storage that a B2B offering would replace.
That is where the real value of this offering sits. Because people will start using it at work, and then bring it into their private lives. Much like Microsoft did in the 90s.
You already got HUGE competition. Just think about Cisco! i think it is called cisco spark.
It claims to be "safe" and is widely accepted by companies. Next problem: If a company want to use a new messenger it normally takes a looong time till it is approved by their IT-department. When i think about my former company it nearly took 1.5yrs to introduce the iphone cause all and everything had to be tested and verified if it is safe...