After thinking long and hard about it, the government view in a lot of countries is that a Internet message app should be viewed as a postal service.
Which include police scanning, drug forfeiture, customs and toll, and end to end being under national claim.
The tl:dr of this case is that by making a P2P message app, making it mainstream, you end up in a situation where you could upset some rather lumbering and slow organizations.
Its also easier to take on high profile targets, than to deal with the culture that causes a lot of the scandals to take hold in society.