There are many opportunities that ope to earn more money when we come from developed countries but in poor countries its citizens will always find it difficult to earn a lot even to get the right one is sometimes difficult, that's why there are many migrant workers because staying in their country will only make them die as a poor.
I live in a country that is heading towards becoming a developed country, there are not many opportunities, even though many opportunities are starting to open up but it is still limited to workers who have skills, so people have to be willing to sacrifice time to add skills in order to earn more income.
With current technological developments, it will indeed make it easier for people to earn more when they have good internet access because in the online world there are many job offers that can be made but haven't to leave the main job so they will have two jobs, so they have the opportunity to save and invest.