How many companies are profiting from a poorly written codebase that just works well enough to be a parketable product and isn't being maintained and there is n

How many companies are profiting from a poorly written codebase that just works well enough to be a parketable product and isn't being maintained and there is no plan to maintain it? I can think of many utilities not being actively developed that are still part of or a product in their own right. Surely that isn't debt in any sense?