The decision does not apply to every game, instead the courts would have to look at each game to see if loot boxes would be considered gambling or not.

From the article:

The Supreme Court of Austria has ruled that the loot boxes in the FIFA games do not constitute gambling as they do require some skill.

GamesMarkt reports that the justices in Vienna have decided that the specific game mechanic in FIFA Ultimate Team is not gambling, but they also state that loot boxes can be gambling. To be specific, loot boxes and the games they are part of need to be taken together on this matter.