Lose what money? They're bribing politicians to make their tax bill zero, and that's on top of the money the government pays them to "do business." Billionaires are a money pit. They are a drain on the communities they inhabit. And dont even get me started on the job creator bullshit.
The reason they dont move to another country is because the united states itself is a tax haven. Other countries either demand more taxes than the US or are much more insecure because of all the economic inequality caused by not taxing rich people.
Let them go.