Over the past year, Ubisoft has halted online support for 91 games. That means multiplayer components associated with these titles will no longer be accessible. You can't access any achievements or unlockables attached either. As The Verge mentioned, support for these games didn't happen all at once and won't necessarily impact all platforms. Many of these are old titles that are no longer playable on modern machines, so you don't have to worry about that. Some of these titles include Tom Clancy's Endwar, Splinter Cell, Ghost Recon Advanced Warfighter 2, Beyond Good and Evil, and more.