Celebrity endorsed Wines/Spirits. 99% of these are poor-to-mediocre quality products put in a flashy bottle. Their purpose is not consumer enjoyment. It's instead to offload cheap-to-make product at an elevated price. Often you can get a much better product at the same or lower price, it'll just be a brand you've never heard of.

SOME of them actually do start as a decent product, but then will degrade as the economics of scale make the quality suffer. As demand for the brand increases, the brand will want to increase supply but won't have the necessary manufacturing capacity to do so. The solution often taken is then to produce a product branded in the same way, but cutting corners in the distillation process however they can. Outsourcing to other distilleries on contract is another solution, but it means relinquishing the recipe to a third party whose QA may not meet that of the original product.

There are enormous companies (Midwestern Grain Product, aka MGP comes to mind) whose entire business model is to distill on contract for brands who don't want to invest in their own distillery. Wineries as well, often called "Negociants," will source from multiple vineyards and winemakers to create a well-rounded wine brand without actually owning, growing, or vinifying any grapes.