My understanding is that their competitors don't (can't?) do this. For example, SIP runs through a central server (e.g., Google's). This allows Skype to run their service more cheaply, and its cheaper to provide service for each marginal user. Its a pretty strong network effect.
This maybe the case for those small VoIP startups, but for big Internet Co. such as Google, Microsoft and other portals who already have big datacenters, this should not be an issue.
This maybe the case for those small VoIP startups, but for big Internet Co. such as Google, Microsoft and other portals who already have big datacenters, this should not be an issue.