Thinking more about Sybil resistance - Nostr's follow-centric design already pushes moderation to the periphery. Instead of universal barriers, what if clients incorporated optional bot-detection signals while preserving user choice? Economic or cryptographic barriers alone risk creating approved-bot markets while excluding legitimate users. The goal isn't preventing fake accounts but reducing their impact without social capital.

I thought about building a service that tells people about questionable follows. "You are following Alice. Consider following AliceNew. Alice shared here that the keys leaked and asked to follow AliceNew" or "Are you sure you want to follow Bob. Many report this account as an impersonator of this other Bob".