Is there a little triangle on the ad in the corner? You can use this button to report an ad.
A third party is responsible for the creatives and while we have requested filters to improve the ad quality, some may not be properly adhering to those quality standards. The best way to be heard is to use the report button on the ad (if available) because it's more of a direct line of communication to the ad networks. The second, but less successful option is to let us know the ad network shown on the end card and we'll do our best to describe the ad to them and request a review.
If that one doesn't have the triangle, let me know the ad network and I'll see what I can do.