League of Legends is an ancient game that just wants to rob you of your money. The creators have developed a way to continue making money off you even after you've bottomed out and gotten all the amazing loot you can waste money on.
The reporting system is designed to eventually ban anyone playing. It doesn't matter if you play poorly or if you play to win and perform outstandingly. They will ban you for "talking" and eventually you'll get permanently banned because you've "talked" too much. They don't black-list your credit card or stop you from making new accounts by logging your isp to their perma ban list. They aren't interested in actually punishing trolls or bad players. They just want to ban you so you continue paying for content that is finite.
If you play this game don't talk in chat. Don't respond to hazing. They will ban you for arguing even if you're not the most profane person in the argument. They don't care about you or your squabbles. They just care about profits on a trashy game that hasn't kept up with the advancements in technology. It's a good way to waste time and money, and not a very good way to have fun.