Look, you don’t have to declare yourself an independent country to evade the laws of countries. Simply get in a boat and motor out to international waters. Suddenly you are no longer under the jurisdiction of the United States government. You can do whatever you like, without declaring yourself an independent country. And if you want to declare yourself an independent country, no one is going to stop you.
But the kicker is that no one is going to pretend along with you. Countries are only countries if everyone pretends they are countries. If people stop pretending, the countries cease to exist. But if they all pretend together, then the countries become real. Kind of like fairies, you know? But no one in the US or Europe is going to pretend that your country is real, like they pretend Barbados or Belize is real.
You can set up banks and databases in international waters if you want, but those banks don’t become more secure simply because you have declared yourself an independent country. They only become more secure if the US coast guard and the IRS agree to pretend they are an independent country. And they won’t do that, because that would mean that they lose out on all the juicy tax money, and can’t arrest you for all those juicy drugs. You would be considered to be under the law of the sea, which exists because all the other countries have agreed to pretend it exists.
And even if your pretend country is recognized, that still won’t help you if you annoy the other powerful countries too badly. Break US law often enough, and you’ll be arrested if you ever set foot in the US. At the very least they will deny you an entry Visa. Annoy them enough and a few US navy ships show up and haul everyone back to Guantanamo Bay.