To be clear… Assuming Bitcoin Knots indeed adopts this BIP444 soft fork, there will be a chain split (airdrop coins) if: - The Knots UASF attracts a minority of the hash rate (but enough to mine at least some blocks) and/or - There is a URSF (user rejected soft fork) to counter it

Ok so apparently rolling back the chain in case of a CSAM OP_RETURN is also proposed as an activation mechanism for this “anti-spam” soft fork drafted by @Luke Dashjr @Luke Dashjr. Also, even if no such OP_RETURN is mined, they want to activate this as a UASF within ~three(!) months. https://github.com/bitcoin/bips/pull/2017/commits/3c718237072c107ced8c3531a487354fbdae55df

So if CSAM ends up in an OP_RETURN (of any size) that gets mined into a block, @Luke Dashjr @Luke Dashjr will reject that block and encourage others to do so as well; basically a UASF, even when that would effectively mean rolling back the chain. (Screenshots from the Bitcoin Knots Telegram channel, shared with permission.)

I think there are broadly speaking two categories of Knots supporters. Category 1: Believes there is a moral difference between (illegal) data in OP_RETURNs vs. Inscriptions. This category includes @Luke Dashjr @Luke Dashjr. Category 2: “I don’t like spam, Luke doesn’t like spam, therefore I support Luke.” This category includes ~everyone else.