DAS still has it's limitations and the white lies aren't the problem. The people who clearly try to use someone else's DAS, or get a DAS for grandma have her go through the line at Coaster and she not ride, or the one's that get a DAS conviently for each person in a party of 4 and each get return times for different attractions hoping a Cast Member will just grant access when they start fussing because they are not paid enough to care... Those are the people that Disney will track and eventually ban for the abuse.
And those that don't want to pay for Genie+, the regular Genie service will still give you some added benefit with some predictive wait times to at least try to point out where you can save time almost. Its like this, if you already know that you can get Pirates, Jungle, & Carpets in first thing in the morning with no wait while everyone goes to SDMT, Space, Thunder, Pan, and Splash. You still save the 40mins at pirates, the 50 at Jungle Cruise, and the 30 at Carpets you might have seen later in the day. That's your "Fastpass" without paying. Genie will try to put more of that knowledge in Guests hands to give the average visitor more value. The key is that they have to trust that Disney truly will want you to maximize your day and see a variety and just not the Instagram Billboard Chart Hits.