Then it becomes a matter of game theory as to whether you cash in the bug immediately to empty the pot, or wait for it to grow even more from the positive feedb

Then it becomes a matter of game theory as to whether you cash in the bug immediately to empty the pot, or wait for it to grow even more from the positive feedback loop of it being "obviously bug free if it grew this large". For state-sponsored actors, 50M would only be a modest sum.