Valve's ban system has made Dota 2 a friendlier place.
Valve, the developers of the popular MOBA Dota 2, have always been very interested in player patterns and finding the best ways to serve the overall community. Over the last few months, Valve found that a lot of people who quit Dota 2 did so not because they were feeders who lost a lot of games, but rather because of the negative communication between teammates. If abusive chat was going on in your game, like other players calling you a noob over and over, Valve found that you'd be more likely to quit. In order to stop the abusive chat, they've implemented a communication ban system that has had quite successful results.
The Dota 2 ban system allows players to report those who are abusing chat. If that player is reported enough over a series of time, he'll be banned (i.e. muted) and won't be allowed to use the chat anymore. However, this severely limits how well the banned player can communicate with his or her teammates. Instead of being able to talk over the mic or type strategies to their teammates using chat, they're limited to pinging the map and using the chat-scroll wheel.
The ban system isn't ideal even according to Valve, but they did find that, "offensive players can be rehabilitated and that they manage to modify their communication so that they don't cause negative interactions. To be able to do that though, they need to know when they're producing negative interactions, and the communication ban system lets them know this."
Through their data, Valve found that their system is working exactly as they hoped and that 60 percent of players don't get banned again after they've been punished the first time. They also found that since the ban was introduced to Dota 2 that there has been a 35 percent drop in abusive chat.
"Overall, we're happy with how the system is proceeding," said Valve. "The communication ban system was an attempt to remove a specific set of behaviors in the community, and given its harshness and the change in expectations it engendered, it was always going to be something that was met with criticism. As is often the case, there's still a lot of work to do, but the early results are promising."
Source: Dota 2 Blog