Key resellers claim legitimacy - the courts say otherwise | Opinion

"Buying activation keys on reseller websites currently ranks among the cheapest ways to purchase a game. While there is controversy between some of these platforms - such as G2A - and developers, users generally consider keys the perfect legal way to purchase games. However, this only applies to keys purchased from authorized vendors; these are usually not the surprisingly cheap offers and this is not the type of key selling this article focuses on."

Please read the full article by Dr Andreas Lober at the website of gamesindustry.