Check out the platform if they're for real, maybe you have deposited to the wrong ones. Exchanges that have interest deposit features and as well as launchpools got to be one of the passive income. But, you are giving your coin's custody to them and you get no private key or seed back from doing that. Many does this but you have to understand it first and the risk is there by allowing them to own your coins once you have deposited it. I do this but not with so much amount and only the amount that I can afford to lose.