And that's why the borders exist in the first place. The point of money is not wealth, but wealth disparity. Money gives you power over those with less, and borders help enforce that disparity. The poverty is a feature, not a bug.
Borders must be abolished to sustain the capacity for life to exist, not to aid in the continuation of capitalism. Capitalism is a reactionary death cult maintained by hyper-exploitating all forms of life.
The thing about being terminally online is that it's incredibly easy to imagine (and see, really) a world without borders. Interacting with people from almost every country in the world daily without even having to put on pants.
Guarantee you if we magically eliminated borders world war 3 would erupt the next day as countries desperately redraw them.
Good idea in principle, but not feasible in this day and age. Humans are simply not sociologically advanced enough to sustain that kind of political venture. For starters, humans produce more than enough food to feed the world and yet food insecurity is rampant even in countries with excess.
Open borders will happen when the rest of humanity's shit has been sorted out, not the other way around.