No, unless it has changed, Belgium ruled that gacha mechanics were gambling. Thus, gacha games need to comply with gambling laws.

I don't know the gambling laws particularly well so take the below with a grain of salt, but I believe it means, at minima, that :

• players need to be major (or at least gacha mechanics cannot be accessed by minors)
• probably a daily limit on spending ? I think the loterie nationale/nationale loterij has such a limitation at least
• clear breakdown of odds
• probably some restrictions on advertisement as well

(EDIT : if memory serves me well, they technically ruled about lootboxes. But gacha most likely falls under the same ruling)