Third-party gambling sites are using items from the Steam marketplace to back bets. People Make Games claims that the marketplaces are growing because of Valve's reported neutrality on the matter. Loot boxes have been criticized for encouraging players to spend real-world money to buy in-game items. DOTA 2 and Counter-Strike are among Steam's most-played games. Game Developer checked the Community Market and found that items were among the most popular. It also found out that Counter Strike: Global Offensive skins are popular with players.