And so we arrive at the old insight that the fight against inequality needs to be global.
But I think you underestimate the possibilities. You can just design the law to make taxation a prerequisite for doing business. That's what the EU is (trying to) do, and it seems to work well.
Doing business in the EU and the US is a lot more profitable than not doing business there, even if you pay taxes. That's kind of the point.
I'd go a step further and say that (particularly if you are in the IT industry) and are also ideologically opposed to megacorps like Facebook, Amazon, etc. that you should deny them the power of your labor.
This is such a weird take. When choosing what to buy, it’s impossible to factor in whether or not you believe the seller is already too rich. How could such a market ever determine the price of goods?
No, free markets work reasonably well. What doesn’t work is extremely disproportionate wealth, which is a result of neoliberal policies from the 80s. Revert those policies (i.e., actually tax the wealthy), and get back to medium healthy economy of the 60s and 70s.
US taxes incomes of their citizens globally, so, no matter where you reside, you're still subject to US tax legislation. The only way to get away from it is to renounciate US citizenship, which I imagine the rich may not be ready to do.