Staking in crypto is like interest in Fiat.
You lend (stake) your crypto and get reward (interest) for it.
I suggest all my Muslim brother to stay away from this new kind usury.
I am quite astonished with what OP has mentioned in this thread.So you are saying if you earn profit on your investments it is sin in Muslim culture?As many have mentioned how do do banks operate in Muslim regions as they are engaging in earning direct interest from customers which is not the case with staking as it is different concept.So you need to inquire first about what you are writing and then gave such comments as everyone wants to earn and if they are earning in any legit manner it is good until they are not hurting someone's sentiments.
Profit on investment is allowed but lending money and earning interest on it is not.
If you invest in some ico/ieo and the projects share it's profit with its token holders, it is absolutely fine.
Staking is different. It's not investment, it is lending.
What about staking coins where the coins don't leave your wallet where all you have to do is activate staking while retaining your full balance without locking it up?