I have a similar experience. Technical challenges are one thing and they can be interesting, but ethics is more important to me.

It was painful to observe that people from countries with difficult economies can spend so much money to hunt for pixels. This is their choice, of course, but at the same time it's a proactive work to keep them hooked.

After I realized what I was getting myself into, I completed the existing tasks and left the company. It's not for me.

Edit: formatting