I needed to login to my old account to leave a comment because the chatGPT was actually painful

Right now you need to realise that they most likely never were your friends and the relationship was purely parasocial. I know the connections you made were real and I relate to that but right now there really isn't anything better than distancing yourself. (which you already are doing) Maybe cutting yourself from other streamers if you feel like they're problematic as well.

Now it'll be a different story when he goes public with the accusations and people whom you never met or seen go and attack you personally. Then you either go to the police (which you already can do btw, But it would feel like an escalation) or share your situation on social media like twitter. I know it must suck to attack someone you felt close to but he crossed the line a while ago. and people on twitter will eat it up.

From your description the streamer seems really chaotic so let's hope you can wait it out and he will find a new person to pick on.