Interesting proposal for a new fee-bumping mechanism: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2020-September/018168.html
Haven't read the mailing list responses, but bitcoin-optech has a nice quick summary: https://bitcoinops.org/en/newsletters/2020/09/23/
It seems to me that this mechanism is a little worse for privacy (it will publicly link UTXOs that are otherwise potentially unlinked), but this seems to be a small consideration. Probably worth that risk in many use-cases, if it mitigates tx-pinning attacks.
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