I have successfully implemented pocket vetoing at the most immoral company I worked for, it was a brief stint (caused by the moral issues) where I could play around not delivering all the features management wanted to gouge their customers by playing with other priorities.

You don't need to do it, you don't even have to explicitly say no, you can just always find (or create) work that's more important to do than breaking your own morals. The worse that can happen is someone else gets the hot potato.