The original iteration of passive income was feudalism. It itself was a set of interconnecting passive income schemes[0], ultimately derived from your ability to own the most economically valuable land. This scheme hinges upon your ability to enclose and exclude access to that land by force -
not prior labor paying off over time.
Of course, the only passive income schemes that work today are the "prior labor" type. But that's because of copyright and patent law, which exist specifically with the idea that you can make something valuable now and charge the public for it later. A creative work or an invention is itself land being excluded by force, but this is a magical abstract land of nearly infinite size[1]. It's enclosers are empowered not through direct force, but through the blessing of a legal priesthood.
Ok, I suppose if we're including force and feudalism, we probably should also include, say, organized crime. But in that case the labor isn't stored, it's slaved: you find suckers and scam them into doing crimes to your benefit, then get them to continue working for you, because if they ever leave you can just kill them, or sick the Feds on them.
Y'know, I'm starting to think passive income is actually just a funny way to say theft...
[0] The two schemes I'm thinking of are manorialism, and something akin to modern rent extraction or "chokepoint capitalism" in which you own a road or river and can charge money to people passing through your land. I forget the name of the latter, and there's probably additional relationships I'm not counting. I know the Holy Roman Empire was lousy with the latter kind.
[1] Since there's far more of this creativity land than there is land on Earth, it's far harder to find land that people want or have to pay for. That's why entertainment is such a ridiculously hit-driven business and why entertainment companies hate rights reversion so much.