I'll agree that dark UX is shop talk, and when talking to users as opposed to colleagues you'll need to clarify. Maybe we need a new word for that use case, but just expanding the UX acronym should be workable.
Maybe we just need to start a poll and brain storm the idea out. (dreaming) I think this is a bad enough problem on software that it needs headlines (with properly shaming name to the activity) in major news sources globally to get the behavior to end.
If it stinks bad enough, no business would want to be associated with it.
