There should be a way to encourage reporting.
You might have laughed after reading the title, but I'm serious,
The only reason people are not getting banned as fast as they should is because they aren't getting reported enough.
For example, an Int'er could get 14 days ban just after one game of feed if 4-5 people reported him, but could keep feeding for 20 games if he only gets reported once every game or so.
How do I know this ? check Int'ers profile, they feed for so long, but dont get banned, while I got banned after one game of Int because I got a lot of reports, and I was banned INSTANTLY, like 30 seconds after the game ended.
So I'm pretty sure this is the case, not just for int'ers but also every other kind of toxicity.
Maybe give some Ip if a person reports someone who was actually toxic ? or something to do with hextech ? a chest or a key ? or maybe just an ip boost ? or even a crest of honour.
maybe you can make it related to your honour system update that should be coming out SoonTM
Also if you're worried about people abusing this system, then you can just make it so false reports/report spamming could either give some kind of punishment, or make the individual's reports invalid, or both
I'm not making this post because I want some kind of reward for reporting toxicity, but because I want to see more toxic people getting the punishment they deserve.
EDIT : added the last 4 lines of text