Yup. Collecting rent is passive income. But you actually need to be rich enough to own the property before you can collect rent.
Interest is passive income. But you need to have enough money to actually make the interest payments worth more than a few cents.
Investment returns are passive income. But you need to have enough invested, in a broad enough portfolio, to reliably pay dividends or return growth. To the point that a market dip in one sector won’t kill your investments.