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those 330 sats txs are anchor outputs for LN channels. It means that are in process of a force closed and also are mixed with many small HTLCs. It's a normal process of closing channels.
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Here's another fun fact since you brought up Lightning.
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It is true that every block has a significant amount of dust UTXOs. I have not measured or defined what is economically unspendable, but I do wonder why hundreds of these tiny transactions always appear on-chain in every single block: