Very. Cool.

I was looking at events from fiatjaf and discovered they were all proof of work events (NIP-13)

So, content-neutral moderation mechanisms, so far, for proof of work and web of trust:

POW:
- NIP 13 POW events
- vanity npubs
- pay to relay
- zaps (sats are just someone else's POW)

WOT:
- follow lists
- ...

There's likely lots more WOT mechanisms; I haven't explored this yet.

If any of the above don't work, then you can fall back to content-based moderation (censorship) mechanisms like mute, block, etc.

Very. Cool.