Feeless block chains are hard to maintain since it means that there needs to be a way to subsidize the cost of at least running the chain. HIVE does this quite well since Witnesses are paid for their work while the normal users don't need to worry about things. At least, HIVE is the only one I have seen so far that is truly fast and feeless. I don't count WAX since you need to pay for memory or space (RAM).
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Good points.
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