If we find a better way to implement reject unrequested transactions in a backward compatible fashion, I’ll withdraw it.
ML post: https://groups.google.com/g/bitcoindev/c/nWUcXBQbLGU Bitcoin Core conceptual discussion: https://github.com/bitcoin/bitcoin/pull/30572
Re-opening there is tx-relay work-in-progress available here: https://bitcoinbackbone.org/.
Open comments on #1663 have been fixed.