These sites offer the purchase of a “loot box” or “case”, the contents of which are not known in advance. Inside may be character skins, weapons, virtual currencies or other digital items. 
They are essentially games of chance that rely on random selection to determine content, similar to slot machines. They offer items of varying rarity, from common to valuable, with a small chance of winning. Vibrant animations and opening sounds increase user engagement, and “near wins” encourage you to keep trying.
On such sites, not only opening boxes is available. There are many other sections, including battles with bots and even other users, the ability to pawn and increase your item, and much more.
What’s particularly cynical is that no age verification is required to participate. The organizers are well aware that their main audience is schoolchildren who spend or even steal money from their parents, thereby exposing themselves to the risk of developing a gambling addiction.
You can top up your balance on such services not only through terminals YuMoneybut also through special acquiringwhich accepts payment in the form of digital goods, automatically assessing their value and crediting the money to the balance.
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