In Ready Player One by Ernest Cline, toward the end
when Wade/Parzival is at IOI, he discovers that the Sixers know the physical locations of both Art3mis, and Shoto. Why didn't the Sixers kill them as soon as they knew where they were, as they did with Daito? Wade was there for several days, so presumably IOI had been sitting on that information for some time. Since both IOI and the four gunters already knew the location of the last gate, keeping Art3mis and Shoto alive wasn't advantageous to the Sixers at that point.