On the question of why we haven’t seen lots of controversial stuff on nostr:
One possibility is that it’s just too early, and the bad actors haven’t discovered it.
Another possibility is that centralized platforms like Twitter, Reddit, etc are hungry for ad revenue, so they end up promoting the controversial stuff that grabs attention. With nostr, there’s no ad revenue, so no profit in generating controversy.
Another is that the centralized platforms become captured by state actors with malevolent intent, unrelated to ad revenue. With nostr, there’s no one to capture.