This literally helped me with my depression. Like most depressed people I surrounded myself with depressing things. I would read existentialist books and listen to emo music. Stopping that helped a lot unsurprisingly.
For some reason you think people with a disease have no agency or ability to cure themselves? Since when has this been the case?
If you imagine yourself to have no agency, you will always be a victim and always have different "diseases" that are uncurable.
There are some diseases that can be cured by effort on the sick persons part. There are some that can't be.
A heroin addiction is very different from a reddit addiction.