I stated already that Gamemaster is just inactive. SWBFII on Steam and GOG are the main ways to obtain the game, and when people get the game, the first thing they find out about is Gameranger, making Gameranger more active.
This past weekend I looked at the list of Battlefront II sessions on Gameranger and there was my server, with 50+, 2 or 3 more servers with over 20-30 players and about 50+ various 4 man sessions.
At that same moment I looked at the Gamemaster server list and there was one clan server with a few people and couple of locked 4 man games.
Gameshare may be better and simpler to use but in reality no body wants to play alone, or alone with bots.