https://matrix.fandom.com/wiki/01
The Machines' A.I. and technological expertise exponentially grew under 01 and eventually lead to the creation of newer more advanced A.I. (a technological singularity). Perfectly able to learn from nature in order to efficiently utilize and sustain it, the Machines became solar-powered and self-sufficient.[2] In almost no time, 01 quickly became a global superpower, and humanity was ill-prepared for the Machines' many technological developments. Eventually, all of Earth's industries, from medical, computer, automative, and household, soon became reliant on 01's exports, converging to the rise and dominance of 01 stocks over the global trade-market. Human currency plummeted, 01's currency rose, and 01's technological advancements, including their chips and A.I., were found in all facets of human society. Unable to compete and fearing an economic collapse, the United Nations placed an embargo on 01.
01 sent two ambassadors to the UN headquarters, who pleaded co-existence with humanity, and presented plans for a stable and civil partnership, but the ambassadors were denied membership and, instead, destroyed at the UN headquarter's General Assembly Hall. In an act of total Machine-rejection, the world's leaders decided on a prolonged nuclear-bombardment of 01, beginning the Machine War.
For all its faults, The Matrix 4 does have humans and a splinter faction of machines staring to cooperate and re-green the planet. It’s sort of a way to show that, even though the Matrix AI tried to make Neo’s big sacrifice all for nothing, he really did make the world a little bit better.
It meant a lot to me when Neo, like, pets the machines. The movie never made a big deal with it, it was pretty subtle and downplayed.