Has now been declared as gambling by Belgium gaming commission. Specifically, all games that revolves around loot boxes or chances to gain "strength" is label as pressure to minors and gambling and therefore must have a permit in Europe. USA is well on its track with declaring it as gambling with games such as Overwatch and EA. This does not limit just Blizzard or EA. games, but all games that revolves around chances and paying to gain an "up," which means Maple Story will be also under the gaming commission radar.
This is a good sign for gamers. It means no more "pay to win" and predatory practices targeting minors to pay for a chance to get stronger or to gamble their life savings away because they feel the need to gambling on loot boxes (chance.)
Here's a video from Chris Lee, in the House of Representatives addressing the issue.