Just to clarify, I assume that for some of these games the actual multiplayer game hosting is not done by EA and follows a P2P model or allows the use of third

Just to clarify, I assume that for some of these games the actual multiplayer game hosting is not done by EA and follows a P2P model or allows the use of third party dedicated server (e.g counterstrike)? So it's just the match making servers that are shut down? If it's just matchmaking then perhaps a third party can support all matchmaking for abandoned games, Steam seems to do something like this with it's built in matchmaking. For example it's still (last I checked) possible to play the original Unreal Tournament online.