Breakage is a term used to describe revenue gained by retailers through unredeemed gift cards or other prepaid services that are never claimed. In these cases, the company pockets the money paid for these items, without actually providing the service or item for which the customer initially paid.
Investopedia
I wrote my last big AmEx Platinum post 1.5 years ago, at the height of the pandemic here in NYC.
AmEx Platinum New Benefits and Beyond – What Do You Do Now?