From GameWatcher: “Ubisoft is “evolving” the chat toxicity system in its multiplayer FPS Rainbow Six Siege by adding a chat filter, it announced in a blog post.
Previously, it had added an automatic ban feature that targeted inappropriate language. Although Ubisoft says it was “effective at curtailing bad behavior”, it also had its intrusive side for players who weren’t using any inappropriate language.”
Source: N4G PC Rainbow Six Siege Chat Filter and Toxicity Update