I see that similar discussions happened in Islamic world and they have a point actually. Staking is too similar lending and you get interest. But if you think about mining, staking is like mining and you don't consume energy. So there are controversies about that. Since staking is only here for less than 10 years we can't talk about that for sure. Everybody should do their own research and if they don't feel alright they shouldn't touch staking coins at all.