I think selling T-shirt on amazon cannot be considered passive income unless it's fully automatic

I don't have success with bitcoin. But now, I can get passive income with selling T-shirt on Amazon.
What is your source of income?
If you want to know about my job, I can share tutorial.
You got a point. Marketing apparels in any site for that matter can not be done passively. Yes, you can use automation tools to make things easy and faster but still when we say passive the meaning is really quite different. Passive to me is just like receiving an interest from a bank deposit or receiving a commission from a customer/client I refer to a program months ago...something like that. Now, having said that, I think there must something wrong with the way the OP had dome with his Bitcoin that is why he never had any success with it.