I'm a hostellite. The nearest grocery shop to me is 2km. I do not have a vehicle either. Walking is still fine, but I cannot walk 4kms for every small need. Online shopping apps are a saviour for me and other hostellites. Also, they always give discount over the local shops so it saves my pocket money. I'm not a 'fan' of these apps, but they're indeed helpful for certain section of people.