It will however have an economic impact on US, if you do that. Think of it as "voting with your wallet". You're voting with your wallet against US.
It's also a political stand. As a foreigner who can't vote against the current US government, or even as a US citizen, your action can have a political impact.
Our political system sucks. I'm deeply affected by the US or Russian government's actions - because the Internet is mostly American and Russian, yet I don't have rights to influence decisions in either of those countries. Our country's minimum monthly wage is $211 and our average - $500, so there isn't even a lot of voting with our wallets that we can do. The only choice I had is to donate to Fight for the Future and plan moving everything to a home server, essentially reverting to my setup from 5 years ago.
It's also a political stand. As a foreigner who can't vote against the current US government, or even as a US citizen, your action can have a political impact.