I've always figured the dream would be to be able to advertise a low price without ever having to deliver it.

Some particularly skeevy car dealers were skewered many years ago for saying "Advertised price is less tax, title, and additional $2,000".

But they CAN get away with saying "The $8.99 burger is $11.99 unless you: - possess one of a range of sanctioned devices - have access to data services - are able to create and manage an account - are willing to opt in to whatever tracking/marketing gimmickry - can claim the "deal" in advance

Each of those steps is a funnel that opts out at least some potential customers from the deal. The 12-year-old who doesn't own a phone can't get the deal. The 85-year-old who can't operate Android can't. The person making impulse purchases and not pre-researching their meal selection misses the offer.

I feel like there's a argument for a precedent akin to "no purchase necessary to enter" for sweepstakes-- no additional purchase, software install, or commitment should be required to claim any advertised offer.