Valve's 2019 key change: why CS2 keys can't be traded or sold
Why Valve locked newly bought CS:GO keys to the buyer's account in October 2019, what it said fraud networks were doing, and how the rule holds in CS2.
History
From CS:GO skin betting to Valve’s crackdowns: the events that shaped skin gambling.
Valve's 2018 trade cooldown: the 7-day lock, trading bots and ExpressTrade
Why Valve made traded CS:GO items wait seven days in March 2018, how it hit skin sites and their bots, and how the ExpressTrade workaround ended.
iBUYPOWER match-fixing scandal: skin bets, Valve's bans and where they stand
The 2014 iBUYPOWER vs NetcodeGuides match, the skin bets placed on it, Valve's 2015 bans and which of the banned players have since been cleared.
Valve's 2016 skin gambling crackdown: the statement, letters and lawsuits
What Valve said about skin gambling sites in July 2016, the letters it sent, the lawsuits and the Washington regulator's demand, and what it all changed.
CSGO Lotto scandal: the owners, the hidden ads and the FTC's first case
How two YouTubers promoted a CS:GO skin gambling site they owned without saying so, how it came out in 2016, and what the FTC settlement required.
CS:GO gambling history: from skin betting to CS2 and trade protection
How CS:GO skins turned into gambling stakes: the 2013 Arms Deal, match betting, jackpot sites, Valve's 2016 crackdown, CS2 and the trading rules since.