I agree she got where she is in no small part due to her family’s wealth. But her staying power is because—to many myself included—she’s a decent songwriter. You can hate her music, perfectly valid, but I disagree with calling her music “mediocre” as though it’s some objective fact.
Like, I fucking hate the Beatles, not my taste, but Paul McCartney and John Lennon were undeniably talented.
It sucks, but sometimes the rich and famous do have some talents that many enjoy. I think she’s one to a certain extent.