‘Nearly All’ Counter-Strike Microtransactions Are Being Used for Money Laundering

Counter-Strike: Global Offensive players will no longer be able to trade container keys between accounts because the trade was part of a massive worldwide fraud network. Players earned cases in Counter-Strike containing weapons and cosmetic upgrades, but had to purchase the keys to open the boxes.

https://www.vice.com/en_us/article/8xw7nx/nearly-all-counter-strike-microtransactions-are-being-used-for-money-laundering