My solution:
Your tax burden is your tax burden. If it’s 15% and you run off to a country where it’s 5% to avoid taxes, that’s fine. You can pay them 5%.
But you’re still on the hook for the remaining 10%.
If the 5% country tries to act as a tax haven and refuses to enforce the remaining 10%, they get a national embargo until they get in line.
Isn’t that already how it works? Currently, US citizens still have to pay taxes when living outside the country unless they’re paying taxes to a specific set of other countries. Although consequences are on the individual who fails to pay and not their country of residence.
I’m not saying for US citizens and US companies. That’s how they avoid taxes - by registering in anther country.
Any person or company that does business in the US, even tangentially.
You’re based out of Panama? Cool. Pay them what they require, then pay the remaining X that a US company would own to either Panama, the US, or some other country you operate within.
Don’t grant them tax havens.