Ask HN: What TLD should I get to avoid U.S. tampering?

You can't avoid it "at all costs". You're going to have to delineate your acceptable risks, conversely your threat model. That's a game-like activity played by your business analyst (you) and your security analyst (possibly also you). Here's the security analyst's next move:

Wikipedia "DNS root zone" reminds us that "The US Department of Commerce NTIA exercises the ultimate authority over the DNS root zone of the Internet." And all electronic computer equipment is in the economic sphere that includes as a huge part the U.S.

Your move, business analyst.

Sweden is good for copyright, but they could extradite you to the US for just about anything else, especially any form of financial crime. And if you're a US citizen, the TLD of your domain name doesn't matter at all. You would have to leave the country and give up your citizenship for it to matter.

My sugguestion is to not end up in prison like the founder of ThePirateBay.

Switzerland (.ch)