That sounds really cheap, if you don't consider that you need to do all the shopping, you need to prepare all the food, and deal with probably a bunch of food waste.
is this your first time being introduced to the concept of cooking?
Are you someone who has the capability to be constantly making money any time you want to? If not and you just have a normal 9-5 job or something close to it, you have plenty of time to shop for an hour once a week, then spend 10-30 minutes a day making your own lunches and dinners and still come ahead financially -- way, way ahead.
I have no idea where you're coming from with the "dealing with food waste" part so I'll just ignore it.
This was actually tried. Cheaper and healthier
https://www.youtube.com/watch?v=QRtoUoBgjDw