Eclair has been monitoring the mempool for preimages since its early versions, using Bitcoin Core's ZMQ notifications for incoming transactions. This ensures that the HTLC success transaction is observed, even if it is quickly replaced, as long as the ZMQ limits are not exceeded. However, Matt suggests that further fundamental work should be done at the bitcoin layer to enhance the resilience of Layer 2 protocols against such attacks. Bastien expresses gratitude for Antoine's contribution.