I think PoW has its place in nostr, but not as spam protection.

I believe PoW can be used to interject signal into a noisey feed (potentially for ML algorithms to pick up).

For example

- You could spend time and energy to mine a high pow event id to boost a post that you saw recently

- PoW boost makes for a true signal over noisey zaps as zaps can easily be gamed for popularity (sending yourself zaps)

Do you think PoW serves a purpose in Nostr?