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Let’s say I send a 200 vbyte transaction with a fee of 200 sats. Then I get to send a replacement for that transaction that is also 200 vbytes and pays 200 sats.
How much did my second transaction increase the available fees in the mempool? Zilch.
Ergo, the relay of my second transaction was free, and I can repeat that until one of my transactions gets confirmed.
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