These aren't incompatible issues. Google has a monopoly maintained by excessive and illegal anti-competitive practices. The majority of users have no clue how to even change their default search engine, which Google actively exploits. Just checking it out - it took no less than 6 clicks into various specific menu and sub-menu settings to do so.

Poll only the subset of people that are actively aware of how to change their search engine and I suspect Google's dominance suddenly completely disappears. Remember, there was a time when Internet Explorer was the leading web browser across all age groups. Then Microsoft was forced to make it easier for people to change their default browser, and suddenly nobody was using IE anymore.