The manipulative tactics listed in the article:

• Consumers cannot see the real cost of digital items, leading to overspending: the lack of price transparency of premium in-game currencies and the need to buy extra currency in bundles pushes consumers to spend more. In-game purchases should always be displayed in real money (e.g.: Euro), or at least they should display the equivalence in real-world currency.
• Companies’ claims that gamers prefer in-game premium currencies are wrong: Many consumers find this unnecessary step misleading and prefer buying items directly with real money.
• Consumers are often denied their rights when using premium in-game currencies, tied to unfair terms favouring game developers.
• Children are even more vulnerable to these manipulative tactics. Data shows that children in Europe are spending on average €39 per month on in-game purchases. While they are among the ones playing the most, they have limited financial literacy and are easily swayed by virtual currencies.