Don't allow accounts to stream anime or tv shows. Make it easy to report it!
There is a trend for people to stream anime series which not only is illegal, since they don't own the content which has copyright, but this will hurt twitch content creators.
Most of these channels are using an illegal streaming website to stream the show on twitch.
If they are using a legal site (for example, Crunchyroll) they are breaking the law by double streaming their content here.
They are not creating their own content, hurting all hard-working streamers that actually put effort on twitch.
The problem is there is no easy way of making a report for this case. When a user reports for copyright it sends them to a link with forms that need to be submitted, discouraging people from actually reporting. I think this is why this trend is only growing.