the non dairy cheaper alternative would be coffee

Not if they offer non-dairy creamer it isn’t…

If an accomodation is offered you cannot charge extra for it. This is not a difficult concept.

If McDonald’s offered vegan cheese as a substitute for their cheeseburgers, and they upcharged someone with lactose intolerance, they’d be in the same trouble. That’s why they never brought the McPlant to US markets - because they didn’t want to introduce an accommodation they couldn’t monetize.