I left ad tech after 10 years. What I was doing 8+ hours a day went against my values. I could not bear the idea (and the truth) that I was NOT making this world a better place, but actually, if I were to tell it bluntly, I was contributing to making it worse. That was what I was dedicating myself and the majority of my working (waking) hours to. Something had to be done. I had to make a choice.