Not everybody is getting into a job just because it makes money. People have passions and ambitions to have an impact on the world sometimes. Doesn't mean that you can't do both at the same time. I chose to not work for one of those ad-tech companies, would have multiplied my salary by 10 easily just at entry level, but optimizing a system so people click more on ads is not what I want to spend my life doing. Of course you could take the big salary and do good with the money... Later... but I don't see many people around me doing that efficiently and a lot of what they give is wasted by people that know how to abuse them for "a good cause". And in the meantime more important work has to be done anyway.