Rule of internet #1, dont just believe random anonymous strangers. Anyone can say they did anything. I have no idea why you didnt get punished. Thats super weird considering how many people do get punished for chat offenses. So if youre being honest, thats weird and no one could possibly know why you specifically didnt get punished, other than the system is flawed, which anyone with the ability to think knows that any system made by humans, is flawed.
It could also be that swearing isnt against the rules and what you said isnt actually all that bad. You may be closer to a punishment now because of it, but havent reached punishment level yet. Riot doesnt really punish people for mild bs unless they do it consistently enough. Maybe 9 games isnt consistent enough? Idk. Youre pretty vague about it.
Either way, you can see how its not proof of anything being useless whether you said it or not, right? One person skirting the system doesnt mean the system is useless.
People get away with murder sometimes, does that mean our justice system is useless?