What you need are royalties, which happily enough come from creating art or inventing.
The rest of passive income is exploiting an edge (like an install base in desktop software) or rent-seeking, both of which if left to be truly passive will be captured by someone willing to put in slightly more active effort.
The rest of passive income is exploiting an edge (like an install base in desktop software) or rent-seeking, both of which if left to be truly passive will be captured by someone willing to put in slightly more active effort.