I wouldn't say hive solved scalability, yes it has fast and free transactions but that comes at the cost of decentralisation, where we have what 21 witness nodes and a few backups, ETH has thousands of validators nodes, making their network more robust.

It doesn't mean ETH itself is decentralised, many of those nodes are cloud based and a large percentage reference the few full nodes available, but it does have less chance of collusion and defence against attacks

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