[toumhi]

Yes, if you use an elastic cloud, by all means, spin more instances :-) Most existing companies still have real servers however.

[bonzoesc]

Most existing companies don't run P2P voice chat networks, either. Using EC2 or some other elastic cloud for emergency supernodes makes a lot of sense, since they can outsource the risk of those machines sitting idle to Amazon.

[TrevorJ]

The "cloud" is still made up of real servers ^.^