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Bitcoin spam is what's unlikely to ever be included in a block.
So it really depends both on the miners and the economic environment.
  • In a high fee environment, single-digit sat/vByte transactions are unlikely to get through and you could direct your node to start filtering them without even verifying against the UTXO set.
  • If there's enough miners out there who don't leave money on the table and are willing to put jpegs on the blockchain, there's no reason to filter them because your node will have to accept them in a block anyway.