I would be very wary of calling at least two if any of these passive income. Medium writing and KDP might have aspects that could be seen as passive income. But the time you need to invest over quite a period to get them started is not passive. They also will not automatically provide a passive return if you stop actively working on them. Yes with KDP allows you to run ads which might allow a bit more access to leave on autopilot. Also you might find some long tail income from Medium, but I think you will find that will dwindle if you are not actively publishing new stories. So neither of these are really passive income.

The crypto is maybe closer to passive income, but what you are suggesting is also dangerous financial advice.