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
if investments such as Ponzi, MLM and cloud mining was definitely not legit so opportunities for make a profit there is very little.
in addition to investment lending in poloniex, you can try the best investments and very profitable that ICOs project of altcoin. it is the best investment option at this time, because I see so many coins are successful they get large investment funds.