Works out very well for EA when they shut down online services after a game is a few years old to get you to buy their new ones. Less so for consumers.This works for a big developer/publisher such as EA but not feasible for Big Ant.
It would have had a match-making server for PC and PS3, while Xbox Live servers covered that for the 360 version - which is why online still works on the 360 version of AC09/IC10 but not the PS3 or PC version.@Chief, did AC09 use P2P or hosted a dedicated server(s)?
I believe Sony have moved to a similar model and the Steam platform provides that stuff on PC (AC09 wasn't a Steamworks game) - so future games should be in a better situation in the long run.