If the cheaters are doing things while waiting for a DAS time that directly go against the reason the user was given DAS it would seem pretty obvious.
For example, let's say the user was given DAS because they are unable to wait more than 30 minutes in any line. Then go wait in a 60-minute line somewhere while waiting for a 90 minute DAS return for a different ride.
Ideas like this keep getting posting in this thread. It is pure speculation.
If someone was doing did this then they would deserve to be called out, for stupidity if nothing else.
I don't think fake-DAS users would do this, because why?
Let's look at Epcot for example. If they enter the park for Early entry, they can get a headliner out of the way without using any pass at all- same as everyone else. If they are a FAKE user, of course they are maxing opportunities, so they are probably making EE/RD. But they'd only get in a line that was short, because anything else is just dumb.
While waiting for Remy, they could do a wide variety of rides that do NOT have a 60minute wait: Pixar films, Imagination, Living w/Land, M:S, Nemo, prob Soarin', SE, Turtle Talk, Moana. They could get breakfast, shop, take photos, do one of the scavenger hunts, look at the Seas' aquariums, or get free soda.
About the only rides that have over a 60min wait before 10am are FEA and maybe Test Track.
But they have DAS. So it would be really dumb park-touring strategy if they went out of their way to wait 60 standby for FEA.
And since they are power-riders, they wouldn't get in the Test Track standby queue either. IF they wanted to ride TT, they'd use the very empty single rider queue.