Other commenters have commented on how the data is biased/cherry picked, and Google would have a different take on the market share numbers. However, it might

Other commenters have commented on how the data is biased/cherry picked, and Google would have a different take on the market share numbers. However, it might be more to Google's benefit to say nothing and use this as evidence of not having a dominant majority share if there is a monopoly lawsuit against them in the US. In fact, I suspect that losing the Firefox search default might actually be beneficial to Google for the same reason.