Just want to give everyone a refresher here as I think some people might benefit from a history lesson:
Prior to 2002, Disney had a "one size fits all" option that encompassed guests with mobility issues (wheelchairs, etc) and sensory/develomental issues. This was basically an immediate FP or "exit pass," for those rides without FP. Around this time, Disney started updating queues to be almost completely ADA compliant.
Then in 2002, due to rampant abuse (mostly due to people getting wheelchairs to skip the line), Disney came out with the GAC (Guest Assistance Card) program, which allowed for a far more tailored approach to disability issues. Guest Relations cast members were trained to ask for what kinds of needs a guest might require. From there, they had a bunch of card options to issue the guest based on the need, including:
- "use a designated wheelchair entrance" for queues that weren't entirely wheelchair accessible,
- "provide a shaded wait area" for queues that were partially outside
- "provide an alternate entrance" for guests who couldn't wait in a standby queue, etc.
The last one worked as an immediate Fastpass all day long. Saying the right words to get this pass became commonplace, as the internet was rife with people sharing tips and tricks to obtain it. Disney was issuing them to literally everyone. The other cards became rarely used. On top of it, you had people getting this pass and giving unauthorized VIP tours, which became a big news story.
To replace GAC, DAS came out and was originally intended to curb abuse. Disney figured that by making guests wait the length of the standby line, people would be less likely to abuse it. This led to a giant lawsuit by the parents of autistic kids about having to wait this length of time but it persisted. However, like the GAC card before it, guests started to learn what to say to get the DAS pass and some self-inflicted wounds by Disney (eg not bringing back a line skipping process post-COVID, making G+ a confusing mess, etc) it led to this current abuse.
the tl;dr here is that DAS is the third iteration of Disney guests finding a way to abuse the system and get perks beyond those they should be getting.