One insight I haven't seen explained so far (related to the filter debate, bitcoin node tx relay):
Tx relay by nodes have two goals:
1. propagate a Tx to nodes that eventually could mine them into blocks
2. propagating to all nodes, in order:
- so they have the txs in their mempool, which speeds up block propagation
- so they can have a more accurate fee estimation from their mempool
- so they see it early if it's a Tx affecting their wallet.
For spam avoidance, it would be nice to filter spam for 1. But the trick is, it is the SAME mechanism for both purposes!
Filtering creates MORE HARM in 2. than benefit for 1. Besides, the benefit is also very limited as there are non-filtering nodes.
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