I don’t see there being any incentive for miners to hash on the the forked chain. The few miners who fell for the propaganda are already on Ocean pool, and specifically the “filtered” templates (since they offer templates with and without their filters). I think that amounts to less than 0.1% of the network hash today. Hypothetically, even if they somehow get 5% of the hashrate, their blocks are going to be extremely slow for several difficulty epochs. I forget the exact threshold, but there’s a circuit breaker where difficulty can’t be lowered by more than N% per adjustment.

The only incentive is valid block propagation. To ensure payment. The only way you can ensure valid block propagation is to make blocks the highest percentage of blocks would find as valid. BIP 110 being stricter would have an advantage via this incentive. Because: BIP 110 valid =Core valid Core valid ≠ BIP 110 valid That is the asymmetric incentive.

Is it correct to call it an attack? BIP110 intention is to reduce spam stored on Bitcoin network going forward. Seems like a fix for unintended use of Bitcoin as storage for arbitrary data. Is there a good reason to not signal for BIP110 and allow spam on the network to continue?