I'd like to know how they tackle battery consumption in a server-less architecture. Skype P2P was a huge battery drainer, linked to the number of contacts you h

I'd like to know how they tackle battery consumption in a server-less architecture. Skype P2P was a huge battery drainer, linked to the number of contacts you have. For instance if you have 50 contacts plus group chats, the client needs to sync one by one and share the data with 50+ points, which might come and go. I care about privacy and latency, I'm not buying the argument that p2p is a solution for those though.