You can’t stop pubkey spam. Publey spam bloats the utxo set. Bloating the utxo set makes it impossible to run a node on minimal hardware because ram requirements become to great. This is already happening today.
An better analogy is. There is a porch shitter who shits on your doormat everyday. You can’t stop them so you put a bucket out to hope that they will have the decency to use it. Welcome to the decentralized permissionless world.
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