They’re under obligation to make a reasonable accommodation. They accomplish this in 2 ways. You can either order it without milk, or you can pay extra for a milk substitute.
Restaurants aren’t required to provide gluten-free pasta, fake seafood, or artificial peanut products just because some people can’t eat everything on the menu.
The ADA has very specific language about not charging extra for reasonable accommodations, and dietary restrictions are mentioned.
Restaurants are not required to stock ingredients for all allergies, and they are not required to order in special ingredients on request. But starbucks does stock non-dairy milks. Using the non-dairy milk that they already stock is a reasonable accommodation.
The case is based on a good faith reading of title III of the ADA. It’s not unreasonable to argue that charging extra is illegal in this case.
Do you have a source? My understanding was that they were under obligation to not charge for the accommodations, hence the lawsuit.
Their accommodation is having product without milk at all. Requiring them to provide an alternative ingredient isn’t a reasonable accommodation when they have plenty of existing products without dairy. The customer can order one of those items.
Having a milk substitute that costs more for the establishment is going beyond what is required under the ADA, so up-charging for it is fine.