BTW, there's an interesting story reporting that the company behind Adblock Plus is offering money to developers of iOS ad blockers to let ads from their whitelist through:
http://www.businessinsider.com/adblock-plus-acceptable-ads-policy-2015-9
I think this will become a problem. There is a lot of money in the advertising business, and many developers will be tempted to accept "bribes" of one kind or another. This is compounded by the lack of transparency for the user: Since you cannot see the filter list in the popular apps, you don't really know what is blocked and what isn't, particularly when it comes to invisible trackers ...