This is literally the traditional definition of passive income - using your capital to generate more capital.
There is no free lunch, you need to provide something to get $$$. If you are providing labour it is by definition not really passive. That leaves land or capital.
So I moved to a cabin in the woods in a country with a low cost of living, and stuck pretty much all of it in the markets.
Had I not done that, I would have had to go back to work - instead I lived a modest life (€500/mo, max) off the income from putting my apartment on Airbnb, and regained my sanity after a decade of relentless work while my investments did their thing.
Anyway, it’s a decade on, still haven’t done a jot of “work”, and the assets are now worth several million, and are being redeployed to continue to maximise value growth - and we now treat ourselves to spending months travelling at exorbitant budgets, real estate, expensive toys - and had enough stability to decide to have a kid.
So yeah, it’s possible - although had we grown at 6%/yr rather than an average of 80%/yr, it would be a different picture - but I firmly believe there are plenty of other opportunities for rapid capital growth elsewhere in the markets, and yet to come. I’m just some average dude who buys equities on vibes and then sits on them for a decade. If I of all people managed it, others can.