It really comes down to the fact that it's hard. Creating a secure P2P network takes a lot of time, a lot of smart people, and a lot of money. Especially on m

It really comes down to the fact that it's hard. Creating a secure P2P network takes a lot of time, a lot of smart people, and a lot of money. Especially on mobile the design is not reasonable. However, a semi P2P network could be an option. For example, a snapchat is sent and the app attempts to send the message directly to the user. If the app is open there is no problem, but if it isn't the message gets sent tp a snapchat server and saved for later. This is a design I used for a P2P email project I worked on and it worked.