if spammers want to PoW their spam, good for them!

because that's kind of the point:

now they needs to invest in real-world real sources to sustain their load, so they have to carefully calculate how far they're willing to go with their spam.

and relays can always set a PoW limit that is high enough.

but I don't think BitAxes will be useful here!

fun fact I learned from skot9000:

Bitcoin mining ASICs can only calculate sha256d hashes for 80 byte preimages.

maybe a skillful hacker could make something work with severe limitations on note size, but I'm actually quite curious to see a potential economy of nostr note mining around GPUs 🎮⚙️