I pick up some sarcasm ... I had brought this argument many times over: POW is indispensable for Bitcoin but on nostr it would really be unnecessary waste. Better add some sats to your post. Some proof-of-payment (POP) instead of proof-of-waste. We all want to know how relays and devs will get paid, yet some support POW? Provably pay sats to me or any of my follows and I will consider it a non-zero-cost message. I might still have a higher threshold to spending time to consume the message and the same might be true with POW but I see zero advantage of using POW vs. POP.