At least in my area, customers have more choices beyond mediocre pizza and chinese restaurants.
Big food delivery is a fundamentally doomed business because the existing companies are treating this like a logistics problem to be solved by technology when really it’s a product problem. To make this business work you need to sell cheap, simple food that’s still satisfying. That means delivery-specific dishes.
Even the better ones cheap out on toppings, size and you don't get as much choice in what you have.
I like frozen pizza well enough, and I'll get it from time-to-time, but if I'm going to get pizza, it's more likely to be takeout, because it just tends to be better and take a similar amount of time. It really is expensive though, so it's not something I have often.
Delivery pizza is a sustainable business when it’s the only place around that will deliver you hot and ready food right now. Everyone else wins on quality.
Pizza delivery is rarely done for one or two eaters. Only makes sense at >5