I can confirm this - I moved twice within Europe, once after a year of working (software dev), and then after 5 more years.
First time I went financially to 0 at the time first salary came, not a nice feeling. I don't have anybody rich in family, rather poor university educated parents (the beauty of communism and some time afterwards - when you are highly skilled engineer, hardworking and manage 200+ people you may get half the salary of some common agriculture worker or trench digger; or when being head of economic departments of 3 high schools combined you deserve even less). I had to adapt 'fuck it' mentality to make this step, otherwise the risks were too high. With kids for example this wouldn't be possible, parents generally move to very risk-averse mindset.
Second move didn't ruin me completely since I've saved up a little, but I had running mortgage which was eating my savings constantly. Plus I've moved to Switzerland and started looking for work - even when living on tuna cans and pasta in flatshare my expenses skyrocketed. Going through this for 2.5 months with very real option of failing and coming back and trying to not lose the mortgage takes some nerves. Again, 'fuck it' mentality helped, this time hardened with 6 months of backpacking in India and Nepal.
In both cases, I've had plenty of folks who were dissuading me from the moves (its hard to find job, more competition, foreign country and language etc. - all true at that time). None I know made similar move to mine. Many of those were talking about it, trying to find some super convenient way through it, asking me after move if I can find some work for them. When I explained to them its not an easy feat and they probably have to move beforehand they ignored the advice. Needless to say all remained where they live.
When comparing my first 100% software dev salary ever and the first after second move, my net income jumped 20x. I was extremely lucky when picking up my university studies to go for software development - it was not popular, we were unattractive geeks to girls, the salaries at least at home sucked and not too much work.
What I want to say with all this - its possible to move out of poverty, but one needs luck (at least with timing of actions), some tungsten balls help, and the less responsibility one has the easier the choices and hardships are. Generally its worth taking risks, but one has to know when to push hard and when rather accept losses and retreat.