Consider all the people that have joined on here all left great positions and would not do so if they didnt see massive potential.
Listen at 15:00 the CEO dropped everything he was doing to get into this. Listen to this interview a couple of times to grasp everything. It's seriously amazing.
Whatsapp sold for about 18 billion and that's just a messaging app....these guys are coming out with their own that will have their own encryption for the most secure message app ever