At the end of July, Valve removed a game called Abstractism from Steam. Seemingly, the game was hijacking players’ computers to mine Bitcoin or another cryptocurrency, as well as faking expensive TF2 (and other) marketplace items. For more about this particular case, check out the Kotaku article or this explanatory video from SidAlpha.
The Abstractism situation is interesting, but I’m more concerned with how the situation indicates the unhappy future (present, even) of Steam.
Considering this game, and more generally the explosion of content on Steam, brings Gresham’s Law to mind. In summary, this Law states that ‘bad money drives out good’ — in other words, any amount of counterfeit currency in circulation devalues the entire economy. In the long term, the value of any coin or token in an economy with counterfeits in circulation approaches zero.