It determined FIFA 18, Overwatch and CS:GO's loot boxes are a game of chance and so are subject to Belgian gambling law. Battlefront 2, at the time the investigation was conducted, did not have loot boxes, so escapes unscathed.
A statement from Minister of Justice Koen Geens said FIFA 18, Overwatch and CS:GO were therefore illegal and demanded their loot boxes removed. If they're not, the publishers "risk a prison sentence of up to five years and a fine of up to 800,000 euros". When minors are involved, those punishments can be doubled, Geens added.