its the X32 bit integer overflow. X32s can hit at max 2.15ishB
think of it this way, you wal koff a cliff, you fall and die a humiliating death. except in programs that arent protected against this you are instead spawned on the other side of the cliff. they bid until they hit -2.15B (paying a negative amount? nullified by math) and instead pop back up with positive 2.15B. dont know how many tokens they need to hit that -2.15B bidding point but yeah, its been ignored, and many more people are taking advantage of it
its ancient, AFAIK even programs back in the early 2000s had protection against this