With smtp hashcash the sender paid for EACH recipien (or receiving server, its been about 15 years since i played with it so memory fades), the message is also extremely ephemeral. In btc the spammer fee is paid once but permanently occupies the blockchain and every node, forever. So the spam narrative seems wrong to me, costs are inverted.

Thats a tax on all participants who wish to support decentalization which is clearly in conflict with Satoshi's comments.

Without being melodramatic ive been musing we end up with Solana size nodes. Even if that was only 20% true it has a cooing effect on decentralization.