Did you know Bitcoin Core got it's 1st fee estimator in February 2015 with Bitcoin Core 0.10.0
Before this fees were hardcoded as a X sats/kbyte, and changed with new versions to reflect market conditions.
Here we can see people in 2010 being very surprised by the fact that fees are even a thing on Bitcoin.
They did not knew the extra BTC they got when mining were transactions fees.
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neat!