I guess this is why hotels can do what they want. Found this in Hilton’s website:

What are the new Waldorf Astoria™ MyWay Benefits?
Effective January 1st, 2018, all Gold and Diamond Members now have the ability to receive complimentary Continental breakfast (or a food & beverage credit) at all Waldorf Astoria™ Hotels & Resorts as a part of their MyWay Benefits.

It basically says they can give continental breakfast OR a food and beverage credit. Doesn’t say where or how much or that is has to be equivalent. Probably why they keep changing it at hotel. They are providing the MyWay benefit as written...