Earlier quoted context omitted.
Many of the jobs on the 80,000 hours board actually seem quite evil: "Research Scientist, AI. Facebook" "Data Scientist, Technology and Resource Investment Decision-making. US Government, Central Intelligence Agency" "Deep Learning Researcher, Computer Vision Algorithms. Baidu"
So a few things here. 1. ML at Facebook and Baidu pay well so you could use that money to fund more effective things. 2. By working in these roles you have the ability to change how things are done. Certainly more than you usually could from the outside. 3. There's a big push in the effective altruism group on safe AI/ML. I disagree with this but that's a factor in their weightings.
For a job board like this, I would prefer that the companies themselves are directly working on high impact problems that are a benefit to society and the environment.
Would also be nice to see a quick description of the impact each company is trying to have.