Honestly those who are in a spotlight for the community get a harsher treatment. Have you not seen people getting bans off Reddit posts alone ? This is because Riot wants to keep the negativity out of the spotlight. Any company who wants their game to do well will use tactics like these. Dunkey is not your average player so he got a harsh treatment. Probably manually. The thing is that in a lot of games you get very few truly toxic people. The description of "toxic" at the moment is overused.
A toxic player is someone who:
intentionally feeds
gives the enemy information about their team
uses racist slurs
uses homophobic language
harasses team members (not one or two comments but actual nonstop harassment)
leaves the game
AFk's
Right now the system for the average player is designed to detect a "trend" of toxic behavior. I have a friend with three banned accounts. Why ? He flames , ints , feeds , afk's and uses racial slurs. He knows he is going to get banned... This is a frequent thing. This player deserves to be banned. Now let's look at what I do.. (I'm kinda toxic)
I call people out for feeding... I question ping people when they die needlessly or get caught out. I ask people "WTF r u doing?" and I also ping spam when someone isn't focusing an objective. I ban team members picks if I do not think that i would like them or if it's a highly contested pick and they are last. Yet I have not recieved a ban. These behaviors are slightly toxic and I am trying to correct them but they do not warrant a ban if they are not a CONSTANT thing. These are still behaviors that if frequent enough will get me a ban.
I have had the same account since season three now and I can say with certainty that the behavior monitoring system is not unfair. I have had chat restrictions. Those are warnings. Riot has no obligation to give you any warnings honestly. If someone cannot contain themselves then maybe they should not be playing the game. They're not hard rules to go by. Do you think the rules are too much to expect out of someone? Do they seem in some fashion unfair to follow ? They were agreed upon by you agreeing to the "Terms of Service" which everyone who plays must agree to.