Not sure about Thailand and it really depends on your lifestyle, but 100k will get you through 2-3 years at most in the other countries, if you live in an urban setting, not really pinching pennies.
Sure, it's theoretically possible, but it's much better to redirect that effort into finding a job you can live with in your own county. Nothing wrong with a bit of wanderlust, and you can certainly get that out of your system with the safety-net of a sustainable career. Do I sound like a parent yet?
The expat thing is done by every generation, it doesn't stick. Gen-X-ers (my people) went to Prague, had great times, made lifelong friends, saved nothing, often developed mild drinking problems, in the end they lost a few years of their earning potential. Did it develop character? Yes. Could it have been done in other ways? Yes. Was it worth it? ehh.
There are other ways to escape from the searing banality of a career inside of Mega-corps filled with assholes, HR drones, soul-sucking labor.
I have about 80k in liquidity and in the back of my mind it's reassuring to know that if something went wrong at my job or I burnt out or got fired I would be ok. With just my savings I could rent a room in my city for something close to 10 years, including all basic necessities. Even just taking a part time minimum wage job I could easily double that time frame.
As it is I live happily in a small space with a very frugal lifestyle. Paradoxically I think going to work knowing that I could walk away at any time actually makes me a healthier and more productive person/employee.
I really like the idea of "barista FIRE": make enough "fuck you money" that you can survive on a low paid job and supplement it a little with your savings, while leaving enough in reserve for retirement.
Also, some countries have a "negative privilege" situation, where even if you try to get a low-wage job, you'll have less priority than others, or your employer will need to pay an extra fee to be able to hire you. Many will resort to illegal employment to avoid that.
And do not forget issues about guarantors: some places are really strict about proving you have the money, and simply making a 1-year rent deposit in advance is not enough.
Overall, even when having the money, some people don't have the "privilege" of being able to spend it as they please, in the country of their preference.
I think that is called "discrimination"
What city, though? I live in a small city (coast, but still), and the absolute crappiest studio will chomp 500€/mo out of your wallet, which roughly translates to over $70k. Anything decent goes easily over $100k and that's rent alone.
This is what 400 EUR get you now: https://www.leboncoin.fr/recherche?category=10&text=bordeaux...
Rooms and studios from 10 to 24 sqm (~100-250 sq feet), half of them unfurnished. So cheaper than here, but still the absolute worst. Well, you can get something for even cheaper but then you start having last floors without elevator and extremely low ceilings, which my back won't ever consider again after the experience.
6 years of extremely cheap 600gbp/month rent is ~$us60k
£600/month is also definitely doable in London (even in Zone 2). I have quite a few friends who earn less than me that wouldn't even consider a room costing more than that.
Portugal is even "better" with a minimum wage of 750€/month
2-3 years might be enough time to study something (something else maybe?) and look for another job or possibly re-invent yourself into another field.
still better than nothing at all btw!