The blame should be put squarely on the shoulders of tophatter.com. They know the quality of what is being sold and choose to look the other way for the sake of making commission and sales fees on these imitation goods. In my estimation and also the interpretation of the law this is outright FRAUD.
Inverse operations are opposite operations that undo each other. Addition and subtraction are inverse operations. Multiplication and division are inverse operations.
Category page. Operations are a form of purchasable DLC introduced in Counter-Strike: Global Offensive consisting of exclusive official and community created content including community maps, an exclusive operation coin, and stat tracking throughout the duration of the operation. Later operations also introduced exclusive weapon collections and cases.