So,... what's the deal with "out of band" payments? Like this one: b44b21fddc507df97a7b935c49975e24b853ebbea713e3de68dab3ab12e934a5

2.6 sats/vByte

1000 inputs. Is this an exchange making a deal with the pools? It seems like "cheating" somehow to me. but if the mining pool is willing to do it, it's their loss-right? block 789912 had a few of them. I find them interesting when I see them. Anyone have any brilliant insights for me?