Just like you created the new Category, "Pools, Hot tubs, and Beaches" because of the excessive demand, you also NEED to create a "Troll Jail" for all viewers who abuse, harass, or 'troll' your Twitch Streamers!
The number of Trolls have become quite excessive, and simply 'banning' an abusive viewer from a single streamer, ONE, that banned viewer can still see and hear the streamer, TWO, that viewer can jump into another streamer, and continue his\her harassment!
You need to create an algorithm that bans that viewer COMPLETELY FROM TWITCH! Perhaps create, along with your current "banned flag", a count of how many times X viewer has been "flagged" (Ex, 3x, 5x, or 10x) and depending on the number of bans, the harassing viewer's Twitch account is frozen for:
"1 week" for 1st offense (flagged for banned 3x)
"1 month" for 2nd offense (flagged for banned 5x)
"6 months" for 3rd offense (flagged for banned 10x)
"PERMANENT" for 4th offense (flagged for banned 11x)
Obviously, Twitch would send said harassing viewer a notification of the number of bans he/she has accrued, with a warning to "stop harassing and abusing Twitch Streamer."

*I strongly recommend you implement this. I've visited many entertaining streamers, and the abusing and harassing trolls is becoming overwhelming, and I've personally witnessed several Twitch Streamers get mentally hurt or insulted by these types of 'imbeciles!'

Thank you for your consideration.