[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.