I think this is what it’s meant to be about. “How do I afford a good amount of protein with not much money?”, is the question it’s answering.
It reminds me of a Reddit post I read several years ago where someone shared their advice on how they managed to live under extreme poverty. They spent a good amount of time talking about what foods are the most cost effective to buy and this chart lines up with what they have been saying pretty well.
Exchange features aren’t in yet. They plan to release it in a 128.x version as it wasn’t ready for today due to technical reasons.