1) It’s straight up proof money and fame, in excess will not make you happy so you can toss the whole “oh you are so privileged you’ve no right to be this unhappy” argument out the window.
Depression does not care. Hence, take money and fame, or relationships for normal people out of the equation when it comes to people who are not destitute or have already exited survival mode.
2) I do think celebrities, living or not with mental health issues provide a romantic and glamorized form of identification for normal people.
How healthy this is is extremely debatable.