- How do you know they aren't getting or going to get punished?
- Everyone is judged based on their own actions. If they are reported, they are judged.
Maybe not today, maybe not tomorrow, but eventually their behavior will get them judged.
Chat restrictions are not detectable on any match history or account listing Ive ever heard of. Harassment, and offensive language doesn't skip tiers unless it is extreme(by the system's standards, not yours). Hate speech typically does skip tiers, but Ive also heard of first time offenders not skipping tiers.
The bottom line here is that you don't know the punishment history of the other players account. As such you are not in the best position to determine if the other players are getting punished, or even in a position to be punished. And Riot is not going to give you those details for privacy reasons.