> If anyone manages to make a messaging app that both has strong security and is user friendly and supports features users expect, they will become very rich. S

> If anyone manages to make a messaging app that both has strong security and is user friendly and supports features users expect, they will become very rich. Seeing as no one has even proposed a solution in theory, it's most likely unsolvable. I'll bet if you can formulate it clearly enough, you can even prove it so. Something like Threema?