Bann multiple accounts with same IP
I think twitch has to improve the way new accounts are created. Recently in a chat I moderate there was a guy creating accounts with the username composed with the streamer's name followed by an insult and despite being banned every single time, he keep creating new accounts every 5 minutes. It's ridiculous that twitch account creation system doesn't prevent that behavior from happening.
Also, after reporting every account one by one, they only removed one of them (the third one), and not the original account nor de subsequent accounts.