Presumably unsatisfied with market share or cost, in about 1990 the beancounters at Dominos decided to rejigger the cheese unto blandness while deliberately poisoning the sauce; their pizza became, in a word, vile. I suspect the new formula saved the company 50 cents per pizza, but it lost me as a customer for 20 years. The sauce formula changed again around 2005 (IIRC) to cause less projectile vomiting IMHO, but their mix of cheese never recovered. Today's Dominos Pizza is but a winsome shadow of what it was in those great early days when the company grew without bounds and the brand was almost eponymous with their one and only product, pizza.
Today, while pizza cheese is widely dissed for its pedestrian lack of flavor and oversmoothed texture, once upon a time, it was something much much more.