Federated Multiplayer Gaming?

While I don't currently play online multiplayer games, I have been following the "Stop Killing Games" campaign, and of course noticed that the main reason that publishers can render games unplayable is centralization.

Games didn't always use centralized servers - they used to be run by players, but simply reverting to that model wouldn't provide the functionality players expect. They want to be able to play with people they don't already know - anyone who's online at the same time.

So it seems like a good use case for federation, do you agree? Each instance could be a "playerbase" and allow games to find players and servers to bring together.