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Mempool filters are subsidies to miners who ignore them
Its much more than that. For a filtered-transaction sender its:
  • additional transaction cost, because filtered-transactions-demand competes for smaller blockspace supply (not filtering miners only).
  • finality time cost. If only 10% of miners accepts my transaction, my finality times goes 10x on average.
So filters create free-market incentive to use some transaction types over others.