UbiBlog highlights a significant change from the upcoming version 3.4 patch for Rainbow Six Siege that will punish players for excessive team kills. They outline a list of penalties that escalate for repeat offenders, saying that some players may end up with permanent bans. The following are highlights on the topic from the patch notes:

If a player repeatedly team kills, they will temporarily be banned from matchmaking. After multiple offenses, a permanent ban may be issued to the offending player’s account.

First offense:

• Casual – Kicked from match.
• Ranked – Banned for 15 minutes, 50% Renown penalty for 30 minutes.

Second offense: Banned from Matchmaking for 30 minutes.

Third offense: Banned from Matchmaking for 2 hours.

Fourth offense: Banned from Matchmaking for 24 hours.

Fifth offense: Banned from Matchmaking for 7 days.

Duration of a suspension will be decided at Ubisoft’s discretion, on a case by case basis. After multiple offenses, the player may receive up to a permanent ban. Actual disciplinary action may differ from the list of examples depending on the severity of the behavior and, again, shall be decided at Ubisoft’s discretion, on a case-by-case basis.