I understand, and I'm glad you're thinking about it, but you could not have been more clear: "I don't think my work in advertising is something harmful to offset." Did you misspeak? Do you think it is harmful but turtledove might reduce the harm?

My work on advertising is on Turtledove

Oh, that was not clear from the essay, and honestly might change my opinion a little. Is your position "targeted ads cause harmful privacy violations, but my work is exclusively devoted to reducing the privacy impact, so I don't believe my work is harmful"? If so I would encourage you to edit the essay, because that's not at all how it comes across right now, at least to readers who aren't familiar with your work. I had assumed turtledove was one of many projects you're involved with.

IMHO, that work is still actively harmful since it seeks to provide political cover for a fundementally harmful activity.

If privacy is not being violated, how is the activity fundamentally harmful?

See repeated explanations all over this thread.