Horrific. If anyone on HN uses or works with adtech you should think about the consequences of what you are building. It's only ever gotten worse. You have a social obligation to stop.
Aren't we all part of some problem one way or the other. You could make the same point to a Programmer in the Banking Industry who is unaware that he is literally creating a predatory interest calculation for a debt scheme by writing code.
We should all consider the consequences of what we work on shouldn't we?
The fact that other people don't isn't a counter argument...