The latest numbers I could find place Google's search market share in China at 19.8%[0]. Sadly, I think 19.8% of China's internet users is much, much larger than the number of people who decide search providers based on the ethical record of the company.

[0]: http://www.webpronews.com/topnews/2009/08/06/google-baidu-sw...

Isn't you charitable donation just a way of making yourself feel better?

".. in other markets maybe even a gain"

Google may lose out in other markets as well. Authoritarian governments will become weary of Google even more now.