> What does the system look like where a human being individually verifies every pieces of data fed into an advertising system?

Probably what it looked like 20 years ago.

Also, relaredly, if there's no moral or ethical way to conduct your business model, that doesn't mean that you're off the hook.

The correct outcome is your business model burns to the ground. That's why I don't run a hitman business, even though it would be lucrative.

If mass scale automated targeted advertising cannot be done ethically, then it cannot be done at all. It shouldn't exist.