Earlier quoted context omitted.
Skype went from point to point systems to routing through a server backend.
Any idea why? Sounds stupid, considering latency losses and increased server costs.
1. Control. They would control the medium, an thus have full control over the communication. Maybe even apply wiretapping if needed.
2. Anonymity. P2P usually means that you know the address of the other participants, with a central server you don't get to know their address. Professionals might need this extra layer of protection.