Shadow Bans or Temporary Bans should be distributed. who continuously violate copyrights. And there are several cases of copyright infringement. Also that these people get banned from appearing on Twitch. Because after 1-2 bans people don't stop and keep violating the songwriter's rights or the author's rights. It should be punished more severely and faster with people who can not leave it.
Based on the video, you can see whether the streamers have used copyright material or not. In addition, the DMCA does not have to be logged on Twitch to discover an offense. Best of all to catch yourself in the act when streaming. The rule is not free and applies to everyone, including in Germany, are upload filters.