Keys that were already sitting in user inventories prior to this update were exempt from the restriction. They remain fully tradable and marketable to this day.
The most straightforward and secure method to buy a tradable key is directly through the official Steam platform. How To Buy CS:GO / CS2 Keys? - SellYourSkins how to buy tradable keys csgo
To acquire a legacy, tradable key, you cannot use the in-game store. You must rely on secondary peer-to-peer markets. 1. The Steam Community Market Keys that were already sitting in user inventories
To understand how to buy tradable keys, one must first understand why they are so distinct from standard keys: how to buy tradable keys csgo