How does this work retroactively on released products?
Say five years ago, I paid a company to build a house, who hired a contractor to build it and it was completed in a year. Nowadays, I open the door daily. Now the contractor goes to the company, saying that from January 1st, every time I open the door, the company has to pay a small fee to the contractor, because they built the house with the door five years ago.
How is that even legal, even in a B2B context? As a company, you have no control over the number of installations. How can they even measure the number of installations for games released 5-10 years ago?