A possible onboarding behavior for "safe nostr experience":

1. Your standard onboarding

2. Choose the level of moderation you'd like applied to your feed (a marketplace for moderation at a relay level)

3. Ability to customize your thresholds later in the settings.

The moderation could live on a separate service layer between clients and relays OR at the relay level. It might be better if relays are untouched though, and your notes are filtered through some sort of service that detects degens and just hides their notes from you so you don't have to be exposed to their garbage.