This clearly definable and fairly narrowly defined use-case from KuCoin soft staking simply illustrates one of the finer points of staking; since rewards are often paid in the currency in which you stake, it’s a good idea to make sure that you want to pour in more of that certain coin like Energi. This soft staking clearly is different from other staking we've known for, a perfect way to tip their users!
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From @rowiestefan