Google just shut down an engineering office in Russia. The decision has occurred in the wake of a legislative crackdown against information about Russia.
The new law forces tech giants to keep information about Russia exclusive to Russians. Meaning that outsiders wouldn't have access to news from inside the country.
Even with the infinite resources and reach of Google, a government that doesn't allow companies the right to free speech can totally hamstring entrepreneurship. The Internet makes money through the free exchange of information.
If any country decides to limit that information, well, then companies like Google can use their infinite reach and resources to move anywhere else in the world.
Corporate tax rates are one things, but limiting a company's ability to communicate is even worse.