For anyone else who feels the need to check for ad-blockers this is a simple implamentation of this detection script for Phoenix.
https://github.com/InteractiveAdvertisingBureau/AdBlockDetection
It's implamented using 2 sitewide hooks so no core changes. It will give you something to play with and refine for your site. It detects if ad-blocker is active in the customers browser and displays a message in a modal window which the customer can dismiss.
It's not in the apps market and I do not plan to support it beyond what is posted here. You are free to edit the hooks code as you like.
AdBlock Check Phoenix V1.0.zip