I always wonder, when discussing with libertarian and fascists, if they are shitposting.
Natural systems and nature are also very popular concepts among far right. It calls for some sort of darwinist, malthusian thought. Nature becomes essence and pureness and whatever you want to defend from deviation and unnatural evils.
But, let's go along with that.
Nature is definitely not capitalist. Animals dont colect rent, they don't exploit other animals. Yeah, they may eat each other some times, but other times, they collaborate and exchange value in a mutualist way. I can see you actually think capitalism as some sort of mutualism. It would be great if it was that way but the more money a person accumulates, the more power they have.
Humans are part of natural systems. Actually when we forget that, we suffer a lot. Let's say, we build our houses where rivers grow when it rains a lot and eventually our house will flood. If we extract lots of carbon from the ground and burn it, the earth system will slightly change and we will suffer a lot. We are actually kind of worthless if you look at the natural system at planet scale. Humans do deviate or forget this connectedness with other non human systems. I wouldn't use nature essence as an argument in favor of communism of capitalism as it doesn't make much sense.
Capitalism, as Marx puts it, (his concept of capitalism is kind of outdated but the following is a general way to understand it) is buying stuff or services to resell them and make profit from that. Business owners buy labor and sell the product of labor taking from that value exchange. So when make money by reselling without adding value, you are stealing, according to Marx. That's the whole critique to capitalism. And it does not come from exclusively from Marx but from many thinkers in that time. Marx is kind of the scape goat. Natural systems don't have that, they don't even have money. Capitalism is a large deviation from (let's not say natural) non-human systems and you can easily see that in the most wealthy countries that have large cities with great comfort that usually taken as examples of capitalism success (say USA), away from non human systems.