CounterStrike:GO and a recent gambling scandal
youtube.com
youtube.com
You can buy some virtual keys and open cases to unlock ingame skins, although those keys cost money. You can also sell your skins on the Steam Market. You can also sell your skins on the black market for actual money.
Gambling with skins has been an issue for as long as the newest version of the game was out.
Recently there was a huge scandal about a person that was getting sponsored to falsely advertise by gambling skins to a website and make huge winnings. The whole thing was fixed and he is the one that exposed it because they refused to pay him as much as he wanted...
Now a new scandal is out involving huge youtubers that co-owned a gambling site and by making videos on youtube winning huge prices without letting anyone know that they own the company.
The video is not mine, although is more explanatory.