It does not mean that the product is not shit. It just means people have been hungry for shit pizza. They have a good business model, and that is all that matters for stockholders.
In college I worked at Pizza Hut & Domino's as a delivery man and I would say Domino's pepperoni pizza was pretty decent and the Pizza Hut thick crust pizza with the cheese in the crust was a novel idea.
I used to eat lots of pizza. After understanding it is a rather unhealthy food, I hardly eat it. crust - flour with no nutritional value cheese - actually processed cheese. an Ultra-processed food with additives/favoring/chemicals/emulsifier bacon - ultra-processed food with soy protein, toxic vegetable oil .... vegetarians like it but such food will shorten their lives. etc