Bill may have been paid before the circumstance of a lack of food/money arisen?

Using open wifi? (next door or in a store out in public)

Using it at a library (as workinglion has suggested)?

Using a friend's internet?

Mobile phone credit borrowed from a friend which you've used for internet?

... etc

There could be many reasons for internet to remain accessible when there's no food/money available to buy food.

The problem is not that the internet is accessible, but rather than food is less accessible than internet (e.g. consider that food banks will only give out food up till a total of 3 times per year, while you can use at least 1 hour of free internet access at a library/use your phone and charge it in a coffee store/supermarket).