As part of the latest patch to Counter-Strike: Global Offensive, Value has made changes to their policy for bad behaviour. Two strikes and you are out, pal. The patch notes read as follows:
A temporary griefing conviction assigned by Overwatch will now be elevated to a permanent conviction if the suspect had a previous temporary griefing conviction.
Previous policy was proportional to the act. Players were given a temporary cooldown period that functioned as a digital timeout. These cases are handled by player investigators in the Overwatch program, which meant to ensure that Global Offensive's community a self regulatory body with regards to cheaters and griefers.
Not all players are happy with this decision. Some players are reporting that their temporary cooldowns have been automatically updated to permanent bans as part of the upgrade. Others are fearful of mistaken convictions. In spite of this, many other players seem pleased to see griefers get their just deserts.
If you are worried that this policy will affect your Counter-Strike experience, my advice is to not be a dick.