An idea

I really think this will work

It might help people be less toxic if they knew how many games they've played that day.

@Riot. Have a counter just sitting on the main page letting that summoner know how many games they've played today. Maybe If that number starts getting a little high said summoner will take a break and chill instead of going on tilt. If they start to play too much don't say anything just let that number build up.

I'm not saying this will fix all toxic behavior, but I think it will help.