I don’t know what advice to give here. I’m not going to tell you that this stuff isn’t really happening, but I will say that I have a relative with schizophrenia and she is frequently bothered that celebrities are stealing songs or books she wrote. I’m not saying this isn’t happening to her, but it happens a lot when she doesn’t take her meds the right way. Once she gets back on the correct dosage, celebrities stop stealing the songs out of her head.
If people are stealing your anime, I’d go look for help stopping that from happening. Even if you’re already on antipsychotic meds, it may be time to adjust them. Every few years ago, it’s a good idea to go to the doctors and get your dosages evaluated.