[ratg13]

You just need to make sure you are not violating any travel visas.

Most regions you tend to be allowed to stay 3 months in a 6 month period on a tourist visa, so as long as you aren't overstaying, you are fine.

The only problems you would face are when leaving a country, if you overstay you may be not welcome back and/or fined.

On entry to a new country, the border agents will be the judge if you are welcome or not.

[netsharc]

And are you sure all countries allow you to "reside" there and work, even though your clients are outside of the country, and the payments are being made into a foreign bank?

I think grandparent's question is legitimate. In most cases the authorities probably don't care much how tourists (or, people with tourist visas) spend their time, but I also wonder if all these nomads follow the letter of the law to the dot -- which would be a feat with the laws of 78 countries.

[idontwantthis]

Most certainly not following the letter of the law, but it also just doesn't really matter. Don't overstay and don't tell them you are working when you try to enter on a tourist visa and its not really possible for you to have any problems. If you do, just leave without making a fuss.

Things become more complicated if you decide you want to stay permanently somewhere while working remotely. Then it depends on the country and how much crap you're willing to put up with.