The tax law for majority of the world citizens is defined by the physical presence. If you spend more than 180 days in any country regardless of what citizenship you posses, you’re liable to pay taxes in that country.
However, if you don’t spend more than 180 days in any country in any given year, your legal tax liability is almost always going to be $0. So if you’re spending 4 months in Pakistan, 4 in Thailand and 4 in Turkey, you owe no income taxes to any of these countries.
If you work as a freelancer, in a tech company, in an e-commerce business or anything that can be done remotely, you can travel the world and legally owe $0 in taxes. If you’re feeling a little adventurous you could spend your potential tax liability on your travels, at no added cost really.
This applies to citizens of most countries in the world with a few exceptions such as citizens of US who are liable to pay taxes in US regardless of their residence.
Even the workers in US can take advantage of state taxes by moving to sunny states with 0% taxes. As Twitter, Shopify have already announced going fully remote, and Facebook planning to do so smoothly over the next 5 years, I see a lot of people taking advantage of this. The biggest loser, of course, would be California.