The classic empty-redeemScript P2SH example address 3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy (HASH160 of an empty script) is anyone-can-spend, and funds sent to it get swept. Anecdotally these sweeps land in the same block the funding confirms, with the winner overpaying fees many-fold.Has anyone published an empirical measurement of (a) the reaction-time distribution (funding → sweep) and (b) the fee-overpayment / RBF fee-auction among competing sweepers for anyone-can-spend outputs (P2SH empty-script, bare OP_TRUE, Lightning anchors, etc.)? I can only find scattered forum mentions, no systematic study. Pointers to prior work appreciated before I write up my own measurements.