Sure, there are ways to "break" it. The point here is to demonstrate that if you try to intuitively go for manual "non-randomness", you won't be as random as you think, sometimes surprisingly off from ~50%.
Actually the quickest way I found to "break" it and hover at ~50% is to simply aim for the dead space between the "F" and "D" keys. If it was using non-adjacent keys like "F" and "J" instead it would be better for its purpose. "Q" and "P" might work even better since it would mostly force you to use 2 hands, making it much harder to score close to 50%.
Actually the quickest way I found to "break" it and hover at ~50% is to simply aim for the dead space between the "F" and "D" keys. If it was using non-adjacent keys like "F" and "J" instead it would be better for its purpose. "Q" and "P" might work even better since it would mostly force you to use 2 hands, making it much harder to score close to 50%.