I know this doesn’t begin to address the larger issue, but just for your personal comfort, have you blacklisted ‘sponsored_badge_icon’? Once I did that, I stopped seeing the horror movie ads (thankfully).
Yes, I blacklisted that as soon as I could. Unfortunately, I still see the ads when using the Tumblr app on my iPad.
My persistence in talking about this isn’t based primarily on my desire to solve the problem for me personally. It’s based more on my desire that Tumblr do a better job of living up to its own stated values, since those are values I agree with and think are important.