Illegal content is already illegal. Storing CSAM is a crime regardless of where it lives. Node operators aren't prosecuted for arbitrary data in witness fields any more than ISPs are prosecuted for packets they route. That's established legal precedent. Appealing to 'Satoshi's intent' is just argument from authority. The protocol defines what's valid, not someone's guess about what Satoshi meant. If the rules allow it and someone pays the fee, it's valid Bitcoin data. You're asking for consensus-level content filtering to solve a legal enforcement problem. That precedent is more dangerous than the problem. Today CSAM, tomorrow 'terrorist financing' CoinJoins, next year whatever moral panic is trending. The line never stops moving once you accept that miners get to judge content.