[ladberg]

That would be more efficient, but GPUs were banned to level the playing field between extremely rich and slightly less extremely rich teams.

Of course, the people who made that rule probably just looked at the cost of a GPU vs the cost of a CPU without realizing that per operation GPUs are much cheaper to run.

EDIT: I originally heard this on Reddit and after looking I can't find any real sources, so this could be inaccurate.