Ya.. and not a single one of those players can see more than 32 (or 64? I forget) players at a time because it's P2P. Hence why I say it's not a traditional MMO.
It's not the same thing as say WoW, for example; Kalimdor, the Eastern Kingdoms and Outland each have their own server. Entering a dungeon forces a new instance to be spawned on the dedicated instance server. All connectivity is handled by the WoW servers.
When I said single shared server I was thinking of Elder Scrolls Online at the time; they have one megaserver per region; all connectivity is handled by that server; so they can have hundreds of players in the same instance at the same time in PvP ... granted their servers are horribad for it and it lags to hell, but hey .. it can do it.
ED does not do that and cannot do that; any form of player connectivity is P2P and the limitation has been played on it because P2P sucks and having too many players will have a negative impact on player experience.
All player to player interaction is handled by your own PC using P2P; initially set up by the match maker so players can find each other and, I think, to receive updates such as player location in the System instance, or friends on the GalMap.
I think there's a mission server as well - seem to recall something like that.
BGS has nothing to do with player to player interaction, which is what I think about when I say multiplayer.
I'm not complaining or anything; I just don't see ED as an MMO as defined by the types of MMO's I grew up with.