Earlier quoted context omitted.
$100 in Chiang Mai is possible for nothing fancy, but only if you speak thai. A fresh of the boat foreigner will pay $250 rock bottom without thai skills for a very basic apartment. Visa costs are at least $50 a month and you'll also need a scooter or deal with pickup taxis, which will add about $80-120 to the expenses unless you enjoy walking or cycling through the heat on roads not made for either of that. Tokyo is…
Japan is much more strict than Thailand on immigration laws, be careful about that. They also have no problem with throwing foreigners into jail, whereas Thailand will usually just deport you for visa violations. Japanese companies also send young Japanese kids to work in Bangkok call centers, since they can pay them less there (the cost of living is lower? They would never dream of having non-Japanese staff the call…
Staying in Thailand beyond 1 year these days legally is also difficult, so it works out the same.
I have never heard about the call center thing and doubt it, but there are plenty of japanese expats in Bangkok that arguably get a lot more work done than 2-3 thais would do at an overall equal cost.
Thailand is really not much cheaper than Japan these days for a foreigner who doesn't speak the language, but it remains a developing country.