Cloud mining would not be a ponzi. Unfortunately, many people are doing ponzi business in the name of cloud mining.
But practically cloud mining must be one of the best opportunity to generate passive income. Once bitcoin price will boom, we may have cloud mining opportunities again with more profits.
Lending is always preferred way of generating passive income. But, needs to be done very careful.
Exactly. But even though, the majority of cloud mining services turn out to become a Ponzi or a scam, and there are only a very minimal percentage of truly legit cloud mining companies which payout as promised but usually their high fees and other factors minimize your chance to really profit mining with them. That is why it is best to mine at home, in my opinion, because you control your own rigs and will know for sure that you will receive the right payout amount.
Still, I see passive income as a very risky method since you would need to invest into something (like an asset, currency, or others) in order to make profit. And to really earn some profit, you would need to invest a good amount of money I think that it may not be ideal for the casual user. I have been looking into lending, but I'm not sure if it can be considered as passive income, but more of like gambling since you lend your money in hopes that you will get it back with interest earnings, and the borrower does not run away with your money. So far, I have been interested into trying lending on Poloniex, but I'm not sure if it has sort of like an insurance in order to protect your lensed money, in case the borrower decides to pull off a stunt like that.