I don't think Google has 90% of the world's search market share. In the west, I'd say that's about correct, but not in China. Baidu takes a big chunk of that and China has a large population. Unless a really small fraction of China uses search engines, I don't see how Google can be at 90% globally.
Edit: Apparently 840 million Chinese use search engines[0] and at least 70% use Baidu[1] which would be 588 million so something like 12% out of those 4.9 billion people. Not sure why the stats aren't reflecting the Chinese population when they claim to be global.
You're probably right, and this underscores the point even more as it means it pays even more than $5.90/user/year, and gets even more ad revenue than $47.30/user/year.
It's probably challenging to get good data on actual search engine market share in China. A bit surprising that this is not properly taken into account for the global stats.
Edit: Apparently 840 million Chinese use search engines[0] and at least 70% use Baidu[1] which would be 588 million so something like 12% out of those 4.9 billion people. Not sure why the stats aren't reflecting the Chinese population when they claim to be global.
[0] https://www.statista.com/topics/1337/search-engines-in-china...
[1] https://www.statista.com/statistics/253340/market-share-of-s...