In general, mental illness should be kept jealously private and only discussed with one's therapist, but this is in regards to the patient protecting themselves. Kanye can do what he wants, but if he is glorifying BPD (I have no idea), then he is indulging in his symptoms and heading towards cautionary tale rather than being a positive role model for other BPD patients and an advocate or activist for mental health, such as Patty Duke, Carrie Fisher, Catherine Zeta Jones, Trevor Noah, and many other celebrities. Life is hard for the mentally ill, and though I'm sure a couple billion dollars can make a huge difference, most BPD patients will end up institutionalized, in prison, or dead repeating Kenye's mistakes.

I'm not saying monetizing one's own mental illness is necessarily wrong, and I think many have been successful throughout history doing so, especially in art, without causing harm. But living in the spotlight, whether intentionally or not, one should, like Spider-Man, recognize there is great responsibility, and take the positive and negative effect it has on others seriously. Again, I don't know what Kenye is doing, only getting glimpses from headlines I can't avoid.