s/let it pass/give lower score Although I admit my idea looks less probable this way. It's still less ridiculous to me that not using keyboard or mouse data.

s/let it pass/give lower score Although I admit my idea looks less probable this way. It's still less ridiculous to me that not using keyboard or mouse data. But on the other hand they may be afraid of people screaming "Google is sending your keystrokes to their servers" etc.