Interest and Rent.
Passiv income in general ,as it obviously constituts itself from other Peoples Active Income , its per definition a scam...
*"Because you once where in need and i lended you some coin , you now have to pay me back a expotentially rising amount of Coin ! its rate of rising is not messured on your harvest or the amount of offspring of your Herd but on Time going forward ! Because it surely will ! , If you Cant you will fall in Debt-Slavery to me. I am a Risktaker . you take the Risk . I Take . Always ." *
they sold you for absolute Fools , Folks !
(PS: Muslims not included)