The ethicists who see their job as publishing papers and acting as philosophy professors, sure, but someone has to own the training and eval suite for how AI thinks about trolley problems.
I think a lot of people confuse ethics training with "don't be evil"
Manually training on "approved" ethical stances sounds a lot like censorship.
The first 10 maybe easy, but we'd see so much disagreement even without money nothing would get done.
You haven't explained why investors make more money by spending money on people to solve trolley problems.