So many good points…

First:
nostr is small. It will either stay small or it will grow. I imagine the latter is the zeitgeist, so the question is … How to keep bots and bad actors at bay in a (scaled-up) decentralized “no sherif in town”  social network? Webs of Trust is the “popular” answer, but the challenge remains … how to weave new accounts directly into webs of trust, and avoid the “din of spam and propaganda” that is sure to be the dominant background noise of Nostr? 

“Social onboarding” is the answer I propose. 

Because WE are the dedicated few who are equipped to succeed in such a task, YOU are actually the ONLY and the BEST person to ask.