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Why is it $10? According to https://www.buybitcoinworldwide.com/fee-calculator/

Fee rate: 51 satoshis/vbyte

SegWit transaction with 1 input, 2 outputs: ~172 vbytes

In total: ~8772 satoshis == ~4.48 USD

[tromp]

Because the average transaction is over 400 bytes in size [1].

[1] https://bitcoinvisuals.com/chain-tx-siz