system
Given the following post, respond as if you're commenting on Reddit:
human
[The Matrix] Why do The Machines have infrastructure? Are they developing or is the entire machine city dedicated towards energy production via humans?

When Neo goes to the machine city in matrix 3, it has the human farms then a metropolitan-esque area. Are the machines developing technologies and expanding?  Or is everything dedicated towards energy production?  They have a society, but what are they advancing?
gpt
The Machines took over the human mega-cities after the War ended, so that explains the metropolitan-esque area. Machine society isn't really expanded upon much, but from what we can tell, a lot of it seems to be dedicated to running and upkeeping the Matrix/Zion illusion. Likely billions of programs trawl the Matrix daily to keep it bug-free and there are Machines that patrol the wastelands in-case some Zionite decides to brave the surface.

>what are they advancing?

They were always looking for ways to improve the Matrix and hope to live along side humans one day without having to blow each other up.