Nope, that's exactly what I mean here. Now, we're talking about my own personal set of ethics here, but it's pretty straightforward:

* Your role is an employee is to help accomplish a corporation's objectives.

* (In this case) the corporation's objectives are unethical.

* You're contributing to something unethical.

That being said, nobody is perfectly ethical. But if I worked for Amazon or PayPal, I'd have quit by now, and I'd never have taken a job with MasterCard in the first place.

I also don't mean "held responsible" in a legal sense, either. They've done nothing wrong legally. Legality != morality, though.