For me, my passive income is by doing my tasks to complete here in signature campaign. This is I think of as of now, since by joining here in any campaign will surely give an earning weekly or depends on the rules. Also, by buying and selling bitcoin were I also earn bitcoin.
That is not really passive income at all, passive income means you dont need to do a thing to obtain your profits, if you need to take some active action to make money then it is not passive.
Investing into gambling websites or making some investment for a regular earning can be considered as passive income. Right now investing and earning needs good capital. Without capital investment we can't get a earning which at least fulfill a small need.