Your mention of "dependents" made me smile.
I'm from Ghana, and from what I understand Ghana and a lot of other countries with these immigrants share the common theme that when people say they're "supporting their family/people back home", "family" is not the meaning that the IRS gives for a dependent, it's very literally everyone who's back home.
For example, decades after moving to the US parents still support dozens of family members back home, not just siblings, but their own parents, cousins, nephews, even people from the same village who aren't necessarily family. Of course on the flip side those are the people who rally together to get them to the US (at least that's how it was for my parents and some other family I've known). It's a support system where people who come to the US are then able to fund things like education that will bring the next generation closer to the standard of living they left to the US for in the first place.
I suspect to workers supporting "family" in that position who don't even have financial security for themselves wouldn't even dream of something like packing it all up living out of a van and bootstrapping their dream startup. In all the years it took my parents years to even get to something considered financially secure, they still had people counting on them back home, I can only imagine the position of those counting someone who just got here on a visa, often at considerable cost relative to what wages are where they come from, meaning they needed help from family.