The possible scenarios you raise really seem to work, but as you said at the beginning, a passive income without effort does not exist.
As I see it, generating income passively implies a previous effort to accumulate capital. Once we have resources (movable or immovable, liquid, passive, fiat or crypto) then we could concentrate on developing a recipe that allows to be placed these on "autopilot", generating interest or ROI.
Thank you for sharing your thoughts and knowledge with us.
Your friend, Juan.