Pizza delivery has been ubiquitous in small town America for decades, and pizza has nothing uniquely suitable to delivery except perhaps standardized packaging. And takeout from all types of restaurants has been even more ubiquitous.
So I'm not sure why you're so confused by the popularity of a service where someone else picks up your takeout order and brings it to you. Other than valid concerns about the labor practices of these delivery companies, and of course the occasional botched delivery (this also happened every so often with traditional pizza delivery in my small town growing up in the 90s), there's nothing to be confused about. It's just paying a bit extra for convenience, a tale as old as time.
So I'm not sure why you're so confused by the popularity of a service where someone else picks up your takeout order and brings it to you. Other than valid concerns about the labor practices of these delivery companies, and of course the occasional botched delivery (this also happened every so often with traditional pizza delivery in my small town growing up in the 90s), there's nothing to be confused about. It's just paying a bit extra for convenience, a tale as old as time.