Overall, isn't your last point also the source of problems? If the whole idea is to be able to exert regulatory control, to protect users, over companies that seem to have a huge share on decision-making in this space due to their unmatched wealth, how is their parting with a minuscule portion of their wealth so they can potentially influence a decision made on the topic of restricting them, solve any problems in the first place? It seems like a stretch to suggest that privacy advocacy groups need money from tech giants to support themselves.
I agree that every organization needs the money but the problem at hand is that every organization should not ideally depend on tech company donations because they have amassed the largest sums. Since this is the problem these laws are trying to address in the first place, I am not sure taking donations from tech giants would solve the problem, even if it doesn't exacerbate it (assuming for a moment that the tech giants are actually being a force of good here).