https://www.gamespot.com/articles/2005s-star-wars-battefront-2-now-has-multiplayer-a/1100-6453730/

Here's something cool and unexpected: 2005's Star Wars: Battlefront II now has online multiplayer support after losing the feature years ago.

GOG, the online PC store operated by The Witcher studio CD Projekt Red, announced today that multiplayer support has been restored. And that's not all. There is no cross-play support with Battlefront II on GOG and Steam, so that should ideally help players find matches faster.