http://www.imore.com/
Greets with a pop-up:
They seem to be using "Admiral" Anti-Adblock fromAdblockers make us sad. We use ads to keep our content happy and free. Please support us by whitelisting us. You can report badly behaved ads by clicking/tapping the nearby 'Advertisement' text.
http://getadmiral.com
The site's greeting page for adblock users asks users to support the site by voluntarily whitelisting. Its tone is polite and understandable, design is consistent with site (e.g. no flashing stop signs), there are no ads on the greeting page, it provides a link to instructions on how to whitelist, the user remains in control of filters and, in fact, is provided a large, central button for continuing to additional site content whether adblocking remains active or not.
In this way, the site attempts to engage visitors in a polite, constructive manner without blocking their option to proceed, and circumvention of that would go well beyond blocking ads into new/different territory that circumvents copyright protection and conflicts with informed user choice. This is an appropriate case for users to be allowed to choose for themselves whether the content of this site is worth supporting.