Actually i can say that i have it but letter bit because recently, i have done investment and got lose, than i hold my bitcoins because i think it is a save way, and when price increase than definitely i will sell it, So you can call it my passive income, but otherwise i have not and also i don't know these ways where we can get passive income.
what kind of investment? you can't say you really invest into such specific things if it was a ponzi scheme or just an MLM,definitely can't say it's a legit investment since it was made to scam people,go try out another investment like lending on poloniex or whatever legit
The only legit or in control investment can be trading in exchanges, that is the best right now i guess if someone can manage to do it, because if you know you have a good enough capital that even if you earn 2% a day from it, it would be enough, then trading alt coins is the best option for you as there you will earn that without any doubt if you know which coins should be traded.