If this is true and that’s a big if, I would bet the money comes from Soros, Gates, Bezos and is funneled through various charitable groups. But it they’re all getting plane tix, why are they all getting off buses at NY Port Authority Terminal. A plane ride from Tucson is a lot more comfortable than a bus ride.
Many might get flagged at airports having no proper papers. Bus trips have no such rules.
They could be giving the best money and prizes to the ones with the most important missions.