In short, it is our effort that brings food in our table. Bitcoin is just one of the currencies we received from that services so I think it isn't correct to think that it is the Bitcoin that gives our food to our table.
In real life also we have to earn food for ourselves like by working and earn money similarly for Bitcoin also you have to do some work or put efforts to acquire it any way you find possible whether it's investment or you want to earn it.It is a currency as well as investment asset which can bring you anything you want we can measure in terms of money.