I can't imagine many people are 'nomadic' as the amount of hassle with moving location every few months would likely eat into productivity. Time zones are also a large factor as you might end up sleeping during the day and working at night (Bangkok has a 11-hour time difference with EST).
What a lot of people are doing is simply taking advantage of the visa free status a western passport provides to remotely work in a low-cost location. Usually Central or South America or South East Asia.
I honestly think that a more worthwhile pursuit is become a remote worker in a cheaper area of your own country or a country you can easily locate legally.
For example contracting for London-based companies whilst living in rural NI or North East England.