Shared ban list auto-ban
Shared ban lists should have the option of auto-banning people on the list (instead of just monitoring or restricting them). Most likely this would have to be paired with some way of categorizing and collaborating on your ban list so you could just share a "worst of the worst" ban list with another streamer and anyone either of you adds there would be auto-banned from both your channels. This could help streamers who have shared values and a close relationship avoid problematic streamers.
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9I36 commented
Sharing a banned list is great against spambots, but against humans it's not, because there are too many different reasons for bans.
So there should be 2 types of bans.
1. Global. All spambots that get there are automatically banned on all channels that share this list. This is essentially a ban list that Twitch should maintain, so instead of shared bans, it's better to make a ban function with a flag that such an account should be banned globally. That ban should be confirmed by Twitch if it's done by someone other than the global moderator. Different implementations can be, I think you get the idea.
2. Local. In this list will be people who violated the rules of the channel or banned for any other reasons. This list can be shared if you are, say, close friends.
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みそにゃー commented
And then you'll have worst of the worst moderators that are power-hungry or dislike a certain person. No thank you.
Maybe a temporary auto ban on new follower. Either way, there can be done something but certainly have to think it through properly.