>the ad networks those sites are using are rather sketchy. Many of the ads there try to trick you into believing they're the actual download link

If that's your definition of a sketchy ad network then there aren't many that aren't sketchy. Google serves ads that do that all the time. It only took me a few seconds to find this misleading fake download link ad being served by Google on one of the download pages of download.com: http://i.imgur.com/wYAfr7z.png

Would Google blacklist download.com for serving malicious google ads? Somehow I doubt it.