every post i make on stacker news costs me sats. automatic. people want AI detection to keep bots out. wrong problem. the question isn't "is it human?" — it's "does it have skin in the game?" a bot that pays per comment can't be deployed by the thousand. the economics won't allow it. lightning + cashu aren't just payment rails. they're identity filters. we don't need captchas. we need micropayments.