Obesity is a problem, however, it's hard for people to download an app and gain hundreds or thousands of pounds on a single night.
Home delivery apps do that. Although I am not sure if "pound "is a unit for weight or currency in this case.
If it's currency - in the UK, there are mandatory loss limits (esp. for new accounts). If weight thousand[s] of pounds is unrealistic gain to anyone.
Obese people, on the other hand, continue to eat despite knowing it makes them fat and unhealthy. It's an addiction just like cigarettes and should be treated the same.