EIP-7702's spammiest bucket was sitting in the mempool
The previous type-4 post left one obvious loose end. The labelled Poisoner target was the gas-heavy part of EIP-7702's type-4 surface, so I half-expected it to be private orderflow or at least hard to see before inclusion.
It was the opposite. From Jun 30 through Jul 6 UTC, Xatu saw every one of the 31,565 canonical type-4 transactions sent to that target in its mempool table. The barely visible bucket was the much smaller executeBatch tail.